Vascular Plants of North Carolina
Account for Appalachian Filmy-fern - Vandenboschia boschiana   (Sturm) Ebihara & K. IwatsukiOnly member of Vandenboschia in NC.
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Section 2 » Family Hymenophyllaceae
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Author(Sturm) Ebihara & K. Iwatsuki
DistributionOnly in the southern mountains, from Rutherford County on the east to Graham County on the west.

This is a Mideastern species, ranging from WV and southern IL south to northwestern SC and AR. Disjunct to Chihuahua, Mex.
AbundanceQuite rare and seemingly declining (or at least with very few recently discovered sites), and despite records for six counties, the NCNHP has only seven records, only five still extant. Thus, it is the rarest of the four dwarf ferns (Hymenophyllaceae) in the state. It is a State Endangered species.
HabitatThis is another rock-loving species, found in shaded places on vertical or overhanging rocks, usually in grottoes where there is some seepage or the rocks are damp.
PhenologyFruits from June to September.
IdentificationThis is the largest of the four "filmy-ferns", with the stems widely scattered along the stem, at least 2/3-inch apart. Each has a long petiole about 2 inches long, with the blades to 5-6 inches long and 2 inches wide. They are deeply cut, twice-pinnatifid. The green sori are located at the tips of the pinnules, 1-4 of them per pinnule. The narrowly triangular blades are long enough that they may hang downward from a rock face, but they can also be oriented horizontally as well. At any rate, this is not a mat-forming species.
Taxonomic CommentsThe species was formerly named as Trichomanes boschianum.

Other Common Name(s)Appalachian Bristle-fern
State RankS1
Global RankG4
State StatusE
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