Asplenium trichomanes L.
Coefficient of Conservatism: 10
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt Fern

Asplenium trichomanes ex W. H. Wagner slide collection

Rock outcrops, talus boulders, crevices in limestone pavement, in shade or partial shade.

Two subspecies, best distinguished by spore size, occur in Michigan, the tetraploid subsp. quadrivalens D. E. Mey., which prefers calcareous substrates, and the somewhat less widespread diploid subsp. trichomanes, which prefers acidic substrates.


Alpena County
Baraga County
Chippewa County
    Including Drummond Island
Delta County
Dickinson County
Gogebic County
Houghton County
Keweenaw County
    Including Isle Royale
Mackinac County
Marquette County
Menominee County
Ontonagon County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 16, 2022.