Coefficient of Conservatism:
Coefficient of Wetness:
Deciduous and coniferous forests of all kinds, by far the commonest oak fern, though becoming rare southward.
Large plants from northern Michigan, especially the western Upper Peninsula (known from Gogebic, Houghton, Mackinac, and Ontonagon Cos.), are apparently the abortive-spored hybrid G. ×brittonianum (Sarvela) K. M. Pryer & Haufler (D. dryopteris × D. disjuncta), suggesting that the western North American G. disjuncta may occur (or once occurred) in Michigan. More study is needed here. See Pryer & Haufler (1993). The rare hybrid with G. jessoense (G. ×intermedium Sarvela) is known from Marquette Co.