Thelypteris concinna (Willd.) Ching
Annotated by Ed Alverson, 31 Jan 2006. Sources: FNA.

Washington: Snohomish County: Heather Lake, ca 7 miles east of Granite Falls on northeast side of Mt. Pilchuck. Elev. 2700 ft.
T30N R8E S21 SE 1/4
Datum: NAD 27. Uncertainty: 805 meters. Coordinate Source: TRS2LL.
North facing boulder slope below cliffs above south end of lake. With Athyrium filix-femina, Aruncus sylvester, Oplopanax horridum, Boykinia elata, Senecio triangularis, Erigeron peregrinus, Cryptogramma acrostichoides, Aquilegia formosa.

Mildred Arnot s.n., Aug 1, 1994
WTU, Accession: 333215, Barcode: WTU-V-014055