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It prefers disturbed areas and coniferous forests, where it can form dense monocultures. The subterranean, brown gametophytes may live for years in the soil before developing vegetative shoots. Its range is in the higher Appalachian mountains northward, and its range ends in northern Georgia and Alabama, but isolated stands have sprung up ...
Many club-moss gametophytes are mycoheterotrophic and long-lived, residing underground for several years before emerging from the ground and progressing to the sporophyte stage. [4] Lycopodiaceae and spikemosses (Selaginella) are the only vascular plants with biflagellate sperm, an ancestral trait in land plants otherwise only seen in bryophytes.
The club mosses commonly grow to be 5–20 cm tall. [4] The gametophytes in most species are non-photosynthetic and myco-heterotrophic, but the subfamily Lycopodielloideae and a few species in the subfamily Huperzioideae have gametophytes with an upper green and photosynthetic part, and a colorless lower part in contact with fungal hyphae.
Diphasiastrum sitchense, the Sitka clubmoss, is a pteridophyte species native to northern North America and northeastern Asia. It is a terrestrial herb spreading by stolons running on the surface or the ground or just slightly below the surface.
They have exosporic gametophytes — that is, the gametophyte is free-living and develops outside of the spore wall. Exosporic gametophytes can either be bisexual, capable of producing both sperm and eggs in the same thallus , or specialized into separate male and female organisms (dioicous).
In Lycopodiella the gametophytes grow on the surface of the soil and are partially photosynthetic. [7] After fertilization, the embryos grow into sporophytes, which are larger spore-bearing plants. [2] The sporophyte is the vegetative part of the plant seen in nature. Juvenile individuals typically re-sprout in the spring or after a fire. [4]