Distinguishing Athyrium ferns
There only two in Washington/Oregon/British Columbia.
A. felix-femina is much more common and looks like a classic simple lady fern with spreading feathery fronds.
A. americanum (pka distentifolium) (ours) is sub-alpine to alpine with fronds relatively erect in sunny locations. There is often a twist near the end of the pinna and often the proximal (stemward) pinnules are folded inward. The general appearance is fluffier than A. felix-femina.
Oreopteris quelpartensis has a gross appearance similar to Athyrium lady ferns and is found mostly in British Columbia and farther north and sometimes in near alpine zones in Washington.
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