• WordNet 3.6
    • n Hymenophyllum type genus of the Hymenophyllaceae: filmy ferns
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Century Dictionary and Cyclopedia
    • n hymenophyllum A genus of usually small and sometimes very minute ferns, including a large number of species with filmy pellucid fronds, found chiefly in hot and damp tropical forests; the filmy ferns or lace-ferns. It is closely allied to the genus Trichomanes, from which it differs in having the two valves of the involucre separate and not blended into a cup. None is found in North America. Two extinct species of this genus have been described from the Carboniferous of Europe, one from the Cretaceous of Kansas, and one from the Laramie group of Colorado. H. Tunbridgense, the Tunbridge fern, is a native of England.
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In literature:

Hymenophyllum, Davallia atrata, Diplazium, Begonia Malabarica?
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
Among the Fern, Gleichenias, Trochomanes, Hymenophyllum, schizea, Danaea, Angiopteris, Salvinia and Azolla.
"Movement of the International Literary Exchanges, between France and North America from January 1845 to May, 1846" by Various