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The resulting multicellular diploid sporophyte produces spore capsules called sporangia. The spores are produced by meiosis , and when ripe, the capsules burst open to release the spores. In some species each gametophyte is one sex while other species may be monoicous , producing both antheridia and archegonia on the same gametophyte which is ...
Diagram showing the alternation of generations between a diploid sporophyte (bottom) and a haploid gametophyte (top) A sporophyte (/ ˈ s p ɔːr. ə ˌ f aɪ t /) is the diploid multicellular stage in the life cycle of a plant or alga which produces asexual spores. This stage alternates with a multicellular haploid gametophyte phase.
In Common Smoothcap moss (Atrichum undulatum), the vibration of sporophyte has been shown to be an important mechanism for spore release. [15] In the case of spore-shedding vascular plants such as ferns, wind distribution of very light spores provides great capacity for dispersal. Also, spores are less subject to animal predation than seeds ...
Starting from a plant which disperses by spores, highly complex changes are needed to produce seeds. The sporophyte has two kinds of spore-forming organs or sporangia. One kind, the megasporangium, produces only a single large spore, a megaspore. This sporangium is surrounded by sheathing layers or integuments which form the seed coat.
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The sporophyte develops a long stalk ending in an elongated spore capsule. The capsule contains a central columella over and around which the spores are produced. When the sporophyte is mature, the capsule ruptures along a single spiral slit to release the spores.
In bryophytes, the sporophyte is a simple unbranched structure with a single spore-forming organ , whereas in all other land plants, the polysporangiophytes, the sporophyte is branched and carries many sporangia. [37] [38] The contrast is shown in the cladogram below: [39]
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