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Cliffs, rocky slopes, talus.
Nova Scotia, New Brunswick and southern Quebec to MN and NE, south to VA, southern IL, and MO, and in mountains to northern GA.
Leaves deciduous, stems brittle; basal pinnules tapering to the base; indusium about 0.5 mm to nearly obsolete, usually entire.
Spores produced late May to early August.
Wetland indicator: NA
Similar to C. fragilis which has basal pinnules that are more or less sessile and has a more northern distribution. Previously treated as a variety of that species, C. fragilis var. mackayi G. Lawson.
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