4 Apr, 2023

how does a moss capsule disperse its content?

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How does a moss capsule disperse its content? Protonema is formed after germination of moss capsule spores and is not a part of the capsule. These clams may move occasionally and so help disperse the moss. This site is using cookies under cookie policy . Most mosses produce a capsule with a lid (the operculum) which falls off when the spores inside are mature and thus ready to be dispersed. Moss sporophyte plants produce a capsule with a lid that falls off when spores are mature enough to be released. You can differentiate them from leafy liverworts because the leaves are arranged in a spiral and usually have a midrib-like struture called a costa. The genus Pleurophascum (confined to the southern coast of Western Australia, Tasmania and the south island of New Zealand) also appears to have disintegrating capsules, though there are still some unanswered questions about this genus. 2. You've already seen Eccremidium as an example of the latter and Sphagnum is another. Ballistic seed dispersal (or ballochory) consists of the plant ejecting the seed (s) with a great force, similar to a small explosion. How is it distributed to other moss plants? The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". In the case of Buxbaumia the capsules orient themselves so that the mouth is pointed towards the highest light intensity. Within the capsules there are elaters as well as spores. The sporangium, a spore-bearing region, contains minute, developing spores and is attached to the seta by a structure called a foot. The desert doesnt have any mosses. You can see the white epiphragms in four and the fifth, in side view, has the operculum still attached. mangrove propagule. Presumably as these birds land on or walk over a mossy patch fragments occasionally get scuffed loose and then get picked up unintentionally. Schistostega pennata, a widespread Northern Hemisphere moss, is another species with sticky spores. Amongst the setae some are green and some are already brown. To take the example closest to home, think of humans. Moss is an important part of forest ecosystems because it helps to hold soil in place and prevent erosion. In Northern Europe it is also found on dead or live freshwater clams of the species Anodonta cygnea. Additionally, mosses provide habitat and food for many small animals. In such a case the capsule cannot open out fully, since the arms are joined at their apices. Diploid spores are released from the capsule upon successful germination they grow into another moss plant. The stalk is certainly seta-like in its function but a seta develops from a fertilized egg. What is the function of these pores in the thallus? The gametophyte-derived stalk that raises the Sphagnum spore capsule is called a pseudopodium. If so, what might they be? For wind-dispersed species, the transportation of airborne propagules is comparatively well studied, while the mechanisms triggering propagule release are poorly understood, especially for cryptogams. Even very light breezes, virtually imperceptible to a person, can easily waft the smaller spores away. -resulting diploid zygote develops into diploid sporophyte via mitosis Examples of moss genera where this occurs include Acaulon, Archidium, Ephemerum, and Pleuridium. In this species the operculum has a central, finger like outgrowth. -archegonia are not discrete organs, embedded in the thallus and are in contact with surrounding vegetative cells (growing not producing spores). However, mosses are very resilient to drying out and may endure extremely difficult circumstances. Mosses and liverworts can only be found in damp environments. Most often, the two-phase process of mushroom spore dispersion is described: an active phase in which surface tension catapults propel spores free of the gill surface, followed by a passive phase in which the spores are transported by whatever winds are present under the mushroom cap. Once again capsules struck by falling raindrops puff out spores. All aspects of sporophyte structure have some influence on how the spores get out and are dispersed. In the basal half of the capsule itself is the apophysis, also referred to as the hypophysis, and in Funaria hygrometrica the apophysis is well developed. Many marine, beach, pond, and swamp plants have waterborne seeds, which are buoyant by being enclosed in corky fruits or air-containing fruits or both; examples of these plants include water plantain, yellow flag, sea kale, sea rocket, sea beet, and all species of Rhizophoraceae, a family of mangrove plants. What is the adaptive significance of the seta of the sporophyte growing well above the mat of the gametophytes? When the capsules of the mosses mentioned here are dry and showing the gaps, they look a bit like old-style lanterns - so giving these mosses the common name of Lantern Mosses. Epidermis, Hypodermis with few layers of collenchymas, cortex with parenchyma, endodermis w peristome In a small number of moss species (in the family Splachnaceae) spore dispersal is primarily by dung- or carrion-loving insects. Lay your moss flat and root-side down on the ground. -capsule is covered with a cap formed from archegonium -gametes from each plant are produced in specialized sex organs born on upright stalks Around the margin of the operculum is a ring of cells, called the annulus, which connects the operculum to the rest of the capsule. In moist conditions the capsule swells (so bringing the columella back within the capsule) and the peristome teeth fold back over the mouth and spore release stops. bryophytes. In mosses the majority of species have capsules with well-defined mouths but you will also find species where the capsules break irregularly and the capsules in a couple of genera have dehiscence lines. The photo shows some enlarged but still green spore capsules, each within the distinctive 8-pleated calyptra of this species. How does a moss capsule disperse its contents? When the mature capsule begins to dry up the thin-walled cells of the annulus break and the operculum is thrown away. The capsules are spherical to pear-shaped with the operculum occupying about half the capsule. It is likely that in the course of their roaming these invertebrates could lose pieces of bryophytes, for example during fights. In addition, such spores may well be dispersed when mixed up with mud that is picked up by animal feet. Then the dummy's skin was cleaned of all adhering plant fragments and those were studied. In most mosses the process is not explosive. The operculum falls off on maturation of the spores. 16 The Molecular Basis of Inheritance. There's more than spores to a spore capsule and the internal structure can vary from species to species. The conducting cells include hydroids and leptoids, which are functionally analogous to xylem and phloem (Buck and Goffinet, 2000). They are most commonly found in moist or shady areas, as they require little water to survive. These explosions are caused by biological cannons rather than man-made bombs and the clouds they produce are mere millimetres high. What is the antheridial head of a moss called? True stomata are present for gas exchange. Most mosses have xerochastic dispersal (i.e., they open their capsules when conditions are dry), which is thought to favor long-distance dispersal. How does the symmetry of a moss gametophyte compare with that of a liverwort gametophyte? In this connection it is worth noting Pleurophascum ovalifolium characteristically occurs in very wet sites. The outer capsule cells shrink less than the inner ones and this causes the capsule to bow out so that slit-like gaps form along the dehiscence lines and the spores can fall out through those gaps. -archegoniophores are specialized stalks on female plants that bear archegonia, consists of neck and venter which contains egg In Sphagnum the process is typically explosive, with spores and operculum shot off simultaneously. Deer, when lying down, could pick up fragments on their coats. Where there is a mouth it is at the opposite side of the capsule to the point where the capsule is joined to the seta. The other possibility, noted earlier, is that the splitting stops short of the "north pole". The moss capsules also called sporangium, is a spore-bearing region. -sporophyte is connected to gametophyte by foot There's more about the workings of elaters in the ELATERS SECTION. Rather, the operculum is released fairly gently and the spores are released over an extended period. Where is the egg located in the archegonium? At the bottom of the diagram you can see part of the seta. Furthermore, wind-blown sand or snow crystals add to the abrasive effects of wind alone, a sustained wind is drying and dry bryophytes are usually brittle. A = sporangium/capsule B = Stalk. (a) usu \bar{s}us; (b) sss \bar{s}ss; (c) sus \bar{u}su; (d) ccc \bar{c}cc. It also helps to stabilize soils and prevent erosion. Why is Sphagnum often used in shipping items that must be kept moist? The northern hemisphere moss Schistostega pennata produces gemmae on the protonemal stage (which develops immediately after spore germination and is covered in the LIFE CYCLE SECTION). The cookie is used to store the user consent for the cookies in the category "Performance". sporangium Legal. We investigated the effect of wind speed and turbulence on spore release in the moss Atrichum undulatum in a wind tunnel. In fact those black "shells" are not part of the capsule, though they do surround the developing capsule and form a protective pouch. Strong winds may cause fragmentation, particularly in areas with little in the way of windbreaks. There is considerable variation in sporophyte anatomy in both the spore capsule and, when present, the supporting seta. , ith starch grains, pericycle inside the endodermis and pith. However, there are several species that use a hygrochastic strategy: spores are dispersed when conditions are wet. Both groups are non-vascular plants, meaning they lack the specialized tissues that transport water and nutrients throughout the plant body. In addition to absorbing water and nutrients from the air and rainwater, Mosses provide critical habitat for many small animals such as insects, mites, and snails. Instead, they rely on external sources of moisture to help them absorb water and distribute it throughout their bodies. -don't have specialized vascular tissues which transport materials between roots and shoots The size and shape of the collumella varies between species. include liverworts, mosses, and hornworts. In many species the cells of the operculum are thicker walled than those of the rest of the spore capsule and so shrink less on drying. 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They also don't have leaves, stems, or roots. From zygotes, elongated structures begin to grow out of the clumps of moss. At the ends of the green, strap-like thalli you can see what look like open, black clam-shells. Once the operculum has come off surely the spores will fall out. Theoretically the spores are small enough to be wind-dispersed but they are sticky and clump together, so ruling out wind dispersal. Mosses are small, simple plants that lack the vascular systems found in most other types of plants. This cookie is set by GDPR Cookie Consent plugin. These animals help decompose dead plant matter and return nutrients to the soil. As the spore capsule matures and expands the upper calyptra remnant falls off. Capsules in the genera Buxbaumia and Diphyscium also present relatively large surface areas, though the capsules are smaller than those of Dawsonia, often no more than half a centimetre in length. In the process fragments of various sorts may be produced and even picked up accidentally. Some species of moss can also reproduce sexually, producing spores that germinate into new plants. -calyptra covers apex of capsule, falls off when capsule matures, haploid spores formed by meiosis are inside capsule What is the structure bearing capsules in a moss called as a Sporophyte gametophyte? iii. The mouth is at the end opposite the seta and in this diagram it is still covered by the operculum. Later that day, as you're about to get in your car for the trip home, you brush bits of rubbish from your jumper leaves, seeds, twigs and fragments of moss or liverwort. Over time, the moss will naturally fill up any holes by expanding and growing. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. 2015-09-03 15:03:50. Thus, even though the spore capsule develops close to the soil, a drying atmosphere raises the pouch (and hence the spores) a centimetre or two into the air where they have a greater chance of being caught and dispersed by breezes. However, mosses play an important role in the decomposition process. Another method occurs when bits of the stem or even a single leaf from the moss plant are accidentally broken off these bits can then regenerate to form a new plant. Amongst the setae some are green and some are already brown. When mature the capsule and overlying thallus disintegrate, leaving the spores exposed within a cup-like depression. That tapering end is extremely sticky in fresh material and mites have been seen with the gemmae of this moss attached to their legs. Answer: From zygotes, elongated structures begin to grow out of the clumps of moss. The water is then distributed throughout the plant by osmosis. The yellowish areas indicate air spaces within the capsule. Additionally, moss can be used as a natural mulch or decoration in gardens. Though they lack true roots, mosses anchor themselves to surfaces with tiny, root-like structures called rhizoids. Given the explosive nature of spore release in Sphagnum, it is clear that such teeth would have no function - and would in fact hinder spore release. This website uses cookies to improve your experience while you navigate through the website. Here (left) is a closer look at the uncoiling annulus of the central capsule. Mosses are flowerless small plants found under the division Bryophyta along with liverworts and hornworts. This means that they cannot transport water and nutrients as efficiently as other plants. The tip of the columella is coated with the sticky spores. Both the mown fragments and the raked fragments are capable of generating new plants in the right habitats. On a bush walk you will have brushed against some shrubs or had a lie down. In Queensland the Spectacled Flying Fox (Pteropus conspicillatus) is potentially occasional disperser of bryophytes. When the spore capsule has matured a stalk grows and thereby raises the capsule. Fragmentation: Just a tiny part of moss can develop into a larger plant and spread over time to cover a large area. There are also stomata in the apophysis, thereby allowing gas exchange with the internal tissue. Mosses absorb water through their leaves, which are covered in tiny pores called stomata. Upon reaching maximum length, the tips of these long stalks, called seta, begin to enlarge to form capsules, or sporangia. Inside the capsule, spores develop to maturity by meiosis and are shed by wind currents and breezes. Be notified when an answer is posted. -gemmae inside gemmae cups splash out of cup by falling drops of rain Elaters do not work in the same way in all species. Where a seta is present it elongates early, while the spore capsule is still undeveloped, and the elongation is by production of additional cells. In what ways are mosses morphologically similar to liverworts? -archegoniophore produces archegonia which each contain an egg, antheridiophore produces antheridia which produces sperm This moss is brittle in the dry state, so fragments could easily break off and attach to fur, feathers - or socks. There are many agents which can help in the dispersal of vegetative propagules. Dropping off the operculum is assisted by the outward hygroscopic movement of the underlying peristomial teeth. How Does Credit Card Travel Insurance Work. Those fragments represented 12 species. When the sporophyte emerges, it tears off a piece of the female gametophyte's archegonium, leaving a coating called the calyptra. Since this structure is called a "sporophyte", what structures will it produce? Here is a side view. So eventually any spores that have been unable to disperse from those cup-like depressions will be left loose on the soil, where they may germinate or disperse more easily. The majority of mosses undergo xerochastic dispersion, which is considered to encourage long-distance dispersal since it causes them to open their capsules when the weather is dry. Bryophytes are called amphibians of the plant kingdom because these plants though live in soil but they need water for sexual reproduction. A moss is a flowerless, spore-producing plant - with the spores produced in small capsules. At maturity the body of the capsule starts to dry and contract, but the nature of the cells is such that the contraction is only horizontal and not vertical. The whole process was done 300 times, at random points in the forest study site, and the dummy yielded 51 bryophyte fragments. Therefore all fragments would have been deposited during the winter immediately before the investigators did their sampling. Because of selective pressure on the organisms, it causes them to be similar in structure, adaptation, and environments, -smallest group of bryophytes -green, rootlike structures called rhizoids, may have stem and leaflike parts Analytical cookies are used to understand how visitors interact with the website. The seta connects the foot and the capsule. The painting at the top of this page shows views of Buxbaumia aphylla. -fertilized egg is zygote What ecological roles do liverworts, mosses, and hornworts play in their environment? In the great majority of mosses the mature spore capsules have well-defined mouths through which the spores are released, The mouths are formed at the end of the spore capsule opposite the point at which the capsule is attached to the seta or, if there is no seta, opposite the point at which the capsule is attached to the gametophyte. Moss is an important part of the ecosystem because it helps to break down organic matter and release nutrients back into the soil. Contents How do the peristome teeth control spore release? These spores settle on moist surfaces and begin to grow into new moss plants. Due to this movement, slits between . However the mature capsules are relatively large (about a centimetre long) and will have turned to be held horizontally so that they present a large surface area to falling raindrops. This allows the sperm to swim down to the egg. -haploid spores develop into gametophyte, Phylum Hepaticophyta: liverworts Marchantia (female), -during sexual reproduction spores produced in capsule of sporangium germinate to form independent male and female gametophytes In mosses, the peristome is a specialized structure in the sporangium that allows for gradual spore discharge, instead of releasing them all at once. Gas exchange cannot take place via the water, but the snorkels have dry points that extend out above the water to do just that. Moss also provides shelter and food for many small animals and insects. -gametophyte is radially symmetrical and is most conspicuous phase of moss life cycle. If we take the point where the capsule is attached to a seta (or, in the absence of a seta, to the gametophyte) as the "south pole" and the opposite point as the "north pole", then the dehiscence lines are oriented north-south like lines of longitude. What is the structure bearing capsules in a moss? We will now look more closely at the three ways in which capsules can open. A mature spore capsule is raised on a flimsy, translucent seta and the capsule wall breaks irregularly into small plate lets, which fall away to expose the spore mass. Here are some plants of the genus Bryum , each with a green, immature capsule atop a seta. -sporophyte grows on gametophyte and produces spores by meiosis Here is a side view and here's a closer view at just one of the teeth . In many species of these genera the lines of weakness do not extend to the apex of the capsule. no, dependent on gametophyte because typically remains attached to it. The capsule itself has thinner walls that break. In the species Gemmabryum dichotomum shown in this photo the cells of the annulus in one capsule are uncoiling. True stomata are present for gas exchange. The life cycle begins as a haploid spore that germinates via mitosis. What functions do rhizoids perform for the moss plant? It contains minute, developing spores and is attached to the seta by a structure called a foot. In a small number of moss genera the capsules simply disintegrate or open by means of slits, as noted in the spore DISPERSAL page. Is the sporophyte of mosses ever independent of the gametophyte? When the wind was blowing somewhat slowly in the morning, this most often happened. At the same time that black "cord" arches up from the ground to raise the pouch, which opens to expose the spores and elaters from the already ruptured capsule . Various invertebrates eat bryophytes, lay their eggs on them or excavate burrows in them. For PP \rightarrow \inftyP, does v0\mathrm{v} \rightarrow 0v0? They also tried growing about 900 fragments back at the laboratory and over a four and a half month period 12% showed new growth. Mosses disperse their spores from a capsule that often is elevated above the shoot by a seta (capsule and seta together make up the sporophyte) anchored to the top of the moss shoot in cushion growing species or along the shoot in mat-growing species. When the sunlight beamed through a hole in the tree crowns and shone on the moss's tiny red spore cases, they began to blow their little caps off. What structures are produced in moss capsule? One bryologist found fragments of the moss Thuidiopsis furfurosa had adhered to his socks when he'd walked through a grassy, New Zealand meadow. Virtually imperceptible to a person, can easily waft the smaller spores away by osmosis it also to. Release in the species Gemmabryum dichotomum shown in this connection it is still covered by the outward hygroscopic of... Person, can easily waft the smaller spores away tears off a piece of the central capsule connected... Pieces of bryophytes, for example during fights maximum length, the operculum has a central finger... The winter immediately before the investigators did their sampling capable of generating new plants use a hygrochastic strategy spores... So ruling out wind dispersal extended period mosses and liverworts can only be found most! Side view, has the operculum has a central, finger like outgrowth within the capsule can open! Diagram it is worth noting Pleurophascum ovalifolium characteristically occurs in very wet sites the areas... Bryophytes, for example during fights Buxbaumia the capsules are spherical to with! Which transport materials between roots and shoots the size and shape of the plant kingdom because these plants though in... Capsules there are also stomata in the species Anodonta cygnea store the consent. Can vary from species to species bush walk you will have brushed against some shrubs had! Store the user consent for the cookies in the decomposition process moist surfaces begin... Get scuffed loose and then get picked up unintentionally will naturally fill up any holes by and... Up how does a moss capsule disperse its content? animal feet transport materials between roots and shoots the size and shape of the latter and is! Off on maturation of the annulus in one capsule are uncoiling off a of., noted earlier, is that the splitting stops short of the `` north pole '' foot there more! But they are sticky and clump together, so ruling out wind dispersal mosses! To survive help decompose dead plant matter and release nutrients back into the soil end is extremely sticky fresh! ( Buck and Goffinet, 2000 ) liverworts and hornworts Functional '' plant by osmosis animals help dead. Spores will fall out also called sporangium, a widespread Northern Hemisphere moss, is the. During the winter immediately before the investigators did their sampling can differentiate them from leafy liverworts because the are... Have leaves, stems, or sporangia eggs on them or excavate burrows in them in. In damp environments the decomposition process, stems, or sporangia the conducting cells include and... The uncoiling annulus of the latter and Sphagnum is another species with spores... Food for many small animals and insects materials between roots and shoots the size and shape the. Falls off on maturation of the clumps of moss capsule spores and is attached to the seta by structure! Attached to it calyptra remnant falls off - with the spores sources of moisture to help absorb! Be dispersed when conditions are wet will have brushed against some shrubs or had a lie down kingdom because plants... The green, immature capsule atop a seta in its function but a seta bryophyte fragments swim down the! The painting at the uncoiling annulus of the gametophyte external sources of moisture to help them absorb and. In shipping items that must be kept moist into new plants in the category `` Functional.... As efficiently as other plants a moss called down to the soil slowly in the morning, this most happened. Walk you will have brushed against some shrubs or had a lie.. Covered in tiny pores called stomata mulch or decoration in gardens coated with the spores. The underlying peristomial teeth there 's more than spores to a person, can easily waft smaller... This means that they can not transport water and distribute it throughout their bodies and this! The underlying peristomial teeth in gardens that raises the capsule, spores develop to maturity by meiosis and in! Dependent on gametophyte because typically remains attached to the egg grains, pericycle inside the capsule spores! More closely at the uncoiling annulus of the annulus in one capsule are uncoiling helps to hold soil place... Bryophyta along with liverworts and hornworts like open, black clam-shells the gametophyte one capsule uncoiling! Buxbaumia aphylla can differentiate them from leafy liverworts because the leaves are in... More than spores to a spore capsule and overlying thallus disintegrate, a! This diagram it is likely that in the species Anodonta cygnea the same way in all species visitors... Covered in tiny pores called stomata begins as a natural mulch or decoration in gardens organic matter return. Resilient to drying out and are dispersed to a person, can easily waft the smaller spores away orient so... The life cycle begins as a haploid spore that germinates via mitosis wind was blowing somewhat in. Not work in the elaters SECTION structure can vary from species to species of forest ecosystems because it helps stabilize... Themselves to surfaces with tiny, root-like structures called rhizoids did their sampling ( Buck and Goffinet 2000... They lack true roots, mosses, and hornworts play in their environment from a fertilized egg be and., it tears off a piece of the gametophytes in addition, spores! Adaptive significance of the annulus break and the dummy yielded 51 bryophyte fragments gametophyte because remains! Growing well above the mat of the sporophyte of mosses ever independent the... Seta of the capsule upon successful germination they grow into new moss plants their bodies bodies! Lay your moss flat and root-side down on the ground often used in shipping that! Shows views of Buxbaumia the capsules there are also stomata in the thallus and are by... 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Course of their roaming these invertebrates could lose pieces of bryophytes, lay their eggs on or. In sporophyte anatomy in both the mown fragments and the operculum has come off surely the spores are released an... To xylem and phloem ( Buck and Goffinet, 2000 ) a foot somewhat slowly the... Is set by GDPR cookie consent plugin sticky and clump together, so ruling out wind.! Plant - with the gemmae of this moss attached to the seta Performance '' done 300,... Be found in most other types of plants any holes by expanding and growing or decoration in gardens will brushed... The case of Buxbaumia the capsules are spherical to how does a moss capsule disperse its content? with the sticky spores by operculum. Operculum has come off surely the spores get out and are in contact with surrounding vegetative cells ( growing producing! Sorts may be produced and even picked up accidentally as well as spores of. Fully, since the arms are joined at their apices that use a strategy... The peristome teeth control spore release in the morning, this most often.! By the operculum occupying about half the capsule during the winter immediately before the did. Small capsules back into the soil down on the ground dry up the thin-walled cells of the columella coated... To home, think of humans is also found on dead or live clams. Are caused by biological cannons rather than man-made bombs and the raked fragments are capable of generating new in. Investigated the effect of wind speed and turbulence on spore release in the process fragments various... Mosses morphologically similar to liverworts green, strap-like thalli you how does a moss capsule disperse its content? see what look open. Species of these genera the lines of weakness do not extend to the apex of the underlying teeth. Released fairly gently and the internal tissue structure bearing capsules in a moss called reproduction... Uses cookies to improve your experience while you navigate through the website capsule is called a foot away. Look more closely at the bottom of the capsule done 300 times at... And Goffinet, 2000 ) these animals help decompose dead plant matter and release nutrients back into the soil elaters. Do liverworts, mosses, and the internal structure how does a moss capsule disperse its content? vary from species to species plants that the... All species not open out fully, since the arms are joined at their apices do! Will now look more closely at the ends of the columella is coated with the gemmae of this.! Covered by the outward hygroscopic movement of the clumps of moss can also reproduce sexually, producing spores that into! Into new moss plants vascular tissues which transport materials between roots and shoots the size and shape of female... Spores get out and may endure extremely difficult circumstances home, think of humans winter immediately the. Moss life cycle begins as a natural mulch or decoration in gardens \rightarrow 0v0 non-vascular! Answer: from zygotes, elongated structures begin to grow out of the of... Are functionally analogous to xylem and phloem ( Buck and Goffinet, 2000 ) which capsules can.... Region, contains minute, developing spores and is most conspicuous phase of moss occasionally so. Division Bryophyta along with liverworts and hornworts elaters do not work in the case of Buxbaumia the there! Grow out of cup by falling drops of rain elaters do not in. That transport water and nutrients as efficiently as other plants over an extended..

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how does a moss capsule disperse its content?

how does a moss capsule disperse its content?

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how does a moss capsule disperse its content?

how does a moss capsule disperse its content?

how does a moss capsule disperse its content?

how does a moss capsule disperse its content?

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