Gymnocarpium dryopteris (L.) Newm.
Common Name: OAK FERN
Coefficient of Conservatism: 5
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt Fern

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.


Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Baraga County
Benzie County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Houghton County
Huron County
Iosco County
Iron County
Jackson County
Kalamazoo County
Kalkaska County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Missaukee County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Ottawa County
Presque Isle County
Roscommon County
Sanilac County
Schoolcraft County
St. Clair County
Tuscola County
Washtenaw County
Wexford County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 3, 2022.