General:
Evergreen from a short, stout rhizome, with clustered fronds.

Leaves:
Narrowly lanceolate, 10-25 cm long, 0.7-1.5 cm wide; rachis not winged, reddish-brown in the lower 2/3-4/5, green towards the tip; pinnae in pairs, egg-shaped to oblong-egg-shaped, 5-10 mm long, 3-6 mm wide.

Notes:
This species is an allotetraploid which originated from a hybrid of the diploid species A. trichomanes x A. viride. Mokry et al. (1986) ascribed our plants to A. adulterinum ssp. presolanense, described from the Italian Alps, but Vogel et al. (1998) consider them to be typical A. adulterinum.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia