[The Ferns of Mt. Adams]

The Lady Ferns of Mt. Adams

The Genus Athyrium

Subarctic Lady Fern

Subarctic Lady Fern: Athyrium filix-femina ssp. cyclosorum

Indusium: A thin outgrowth of epidermal tissue from a fern leaf that covers the sorus.

Alpine Lady Fern: Athyrium alpestre ssp. americanum - Plants of subalpine slopes. Indusium absent.

Subarctic Lady Fern: Athyrium filix-femina ssp. cyclosorum - Plants of moist, low- to mid-elevation forests. Indusium present.


Paul Slichter