''Crepidomanes intricatum'',

synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are al ...

''Trichomanes intricatum'', is known as the weft fern. The genus ''

Crepidomanes ''Crepidomanes'' is a genus of ferns in the family Hymenophyllaceae. It is mostly distributed through the old world The "Old World" is a term for Afro-Eurasia that originated in Europe , after Europeans became aware of the existence of t ...

'' is accepted in the

Pteridophyte Phylogeny Group The Pteridophyte Phylogeny Group, or PPG, is an informal international group of systematic botanists who collaborate to establish a consensus on the classification of pteridophytes (lycophytes and ferns) that reflects knowledge about plant relatio ...

classification of 2016 (PPG I), but not by some other sources. , ''

Plants of the World Online Plants of the World Online (POWO) is an online database published by the Royal Botanic Gardens, Kew. It was launched in March 2017 with the ultimate aim being "to enable users to access information on all the world's known seed-bearing plants ...

'' sank the genus into a broadly defined ''

Trichomanes ''Trichomanes'' is a genus of ferns in the family Hymenophyllaceae, termed bristle ferns. The circumscription of the genus is disputed. All ferns in the genus are filmy ferns, with leaf tissue typically 2 cells thick. This thinness generally ...

'', treating this species as ''Trichomanes intricatum''. This is an unusual filmy fern that grows in rock shelters and crevices in the eastern

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five ma ...

, being known only from its

gametophyte A gametophyte () is one of the two alternation of generations, alternating multicellular organism, multicellular phases in the life cycles of plants and algae. It is a haploid multicellular organism that develops from a haploid spore that has on ...

generation. It is a rare plant that is protected in several US states. Recent study has found a relationship between this species and an Asian filmy-fern species, ''

Crepidomanes schmidianum ''Crepidomanes'' is a genus of ferns in the family Hymenophyllaceae. It is mostly distributed through the old world but has one species Crepidomanes intricatum in North America. The genus includes the following taxa according to Ebihara et al. ...

''. Both share the same

chloroplast A chloroplast () is a type of membrane-bound organelle known as a plastid that conducts photosynthesis mostly in plant and algal cells. The photosynthetic pigment chlorophyll captures the energy from sunlight, converts it, and stores it ...

genome In the fields of molecular biology and genetics, a genome is all the genetic information of an organism. It consists of nucleotide sequences of DNA (or RNA in RNA viruses). The nuclear genome includes protein-coding genes and non-coding ...

. The relationship is uncertain. In 2011, Atsushi Ebihara and Alan S. Weakley transferred ''Trichomanes intricatum'' to ''Crepidomanes intricatum'' based on the chloroplast molecular sequence data. Trichomanes_intricatum1-BobKlips.jpg Image:Trichomanes_intricatum3-BobKlips.jpg, Closeup

References

Hymenophyllales Ferns of the United States Flora of the Northeastern United States Flora of the Southeastern United States Flora without expected TNC conservation status {{Polypodiidae-stub