|Appalachian Rockcap Fern, Appalachian Rock Polypody
|Moist rocks at low to high elevations, especially in ravines, on north-facing outcrops, and in other moist sites, rarely epiphytic on tree trunks.
|NL (Newfoundland) west to e. ON, south to n. GA and n. AL; nearly restricted to the Appalachian Mountains.
|Common Rockcap Fern, Common Rock Polypody
|Haufler and Windham (1991) indicate that the tetraploid cytotype (P. virginianum) of the P. virginianum complex is an allotetraploid derivative of the sterile hybrid of the diploid occurring in our area (P. appalachianum) and another diploid with a boreal distribution (P. sibiricum Siplivinsky)