Coefficient of Conservatism:
Coefficient of Wetness:
NORTHERN OAK FERN
Outcrops of non-calcareous rocks, often in partial sun; very local.
Michigan plants are subsp. parvulum Sarvela, which is sometimes recognized at the rank of species as Gymnocarpium continentale (Petrov) Pojark. For hybrids see Gymnocarpium dryopteris.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 13, 2019. https://www.michiganflora.net/species.aspx?id=529.