Links to genera Ferns and Horsetails (Monilophytes) Clubmosses and Quillworts (Lycophytes)
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| Hymenophyllum | Filmy Ferns
Small, mostly epiphytic or epilithic; rhizomes thin, creeping, glabrous; leaves simple to 4-pinnate, arranged singly along rhizome, thin and translucent - one-cell thick except along veins; sori enclosed in valve-like indusium developing at ends of veins on edge of blade.
About 300 species worldwide. Two species in Britain and Ireland.
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