''Physematium obtusum'', the bluntlobe cliff fern,
is a common rock fern of
Appalachia and eastern
North America. It prefers a calcareous substrate, but also grows in neutral soils. It may grow on rock faces or in scree.
This fern is often confused with various ferns of the genus ''
Cystopteris
''Cystopteris'' is a genus of ferns in the family Cystopteridaceae. These are known generally as bladderferns or fragile ferns. They grow in temperate areas worldwide. This is a very diverse genus and within a species individuals can look quite ...
'' but is distinguished by its hairy nature.
References
obtusum
Ferns of Canada
Ferns of the United States
Plants described in 1840
{{Polypodiales-stub