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Ferns and Horsetails (Monilophytes)
Clubmosses and Quillworts (Lycophytes)
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.
Hymenophyllum tunbrigense Tunbridge Filmy Fern Hymenophyllum tunbrigense thumbnail, link to H. tunbrigense page
Hymenophyllum wilsonii Wilson's Filmy Fern Hymenophyllum wilsonii thumbnail, link to H. wilsonii page
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