Cystopteris laurentiana (Weath.) Blasdell
Common Name: LAURENTIAN FRAGILE FERN
Coefficient of Conservatism: 9
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt Fern
Status: SC
Cystopteris laurentiana with glands C. Rothfels with glands

Calcareous rock outcrops, usually limestone or sandstone, mostly in partial shade or shade.

This is a fertile hexaploid derived from the diploid C. bulbifera and the tetraploid C. fragilis. Reports of C. tennesseensis Shaver from limestone outcrops in northern Michigan appear to be based on specimens of C. laurentiana.

Locations

Alger County
Chippewa County
    Including Drummond Island
Delta County
Dickinson County
Houghton County
Keweenaw County
Mackinac County
Marquette County
Ontonagon County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 16, 2017. http://michiganflora.net/species.aspx?id=522.