Woodsia scopulina subsp. appalachiana
Contr. Univ. Michigan Herb. 19: 58. 1993.
Scales of stems and petiole bases mostly bicolored with broad, usually continuous, dark central stripe, scales narrowly lanceolate. Pinnae with longest hairs composed of 5–8 cells. Indusial segments broad, not at all filamentous. Spores averaging 39–46 µm. 2n = 76.
Phenology: Sporulating summer–fall.
Habitat: Shaded cracks and ledges on cliffs, mostly subacidic shale and sandstone
Elevation: 300–1700 m
Ark., Ky., N.C., Tenn., Va., W.Va.
"thick" is not a number.