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Cliffs, rocky slopes, talus.
Circumboreal, south in North America to MI, VT, and in mountains to NC.
Leaves deciduous, stems brittle; basal pinnules broad-based and mostly sessile or subsessile; indusium to 1 mm, usually cleft at the apex.
Spores produced late May to early August.
Wetland indicator: FACU
Similar to C. tenuis which has basal pinnules that taper to the base and has a more southern distribution.
Gleason, Henry A.
and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States
and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
Michael Hough © 2018