Peltigera pacifica Vitik.
Annotated by Daphne Stone, 2010.

Washington: Pierce County: Mt. Baker-Snoqualmie National Forest, Snoqualmie Ranger District, Upper White Thin Unit 14: Huckleberry Creek. Follow highway 410 to the FS 73 road. Follow the FS 73 road approximately 2 miles south, then turn right on FS Road 7320, follow 7320 approximately 0.25 miles, to bermed old logging road on the left: look for yellow flagging just behind the berm. Walk on this logging road for approximately 2.0 miles to a set of yellow directional flags. Follow directions downhill. Elev. 2525 ft.
604585E, 5211035N; T18N R9E S14 NE 1/4 of SW 1/4
Datum: NAD 27. Uncertainty: 805 meters. Coordinate Source: TRS2LL.
An ALRU-dominated seral riparian forest, with scattered-occasional THPL, ABGR, and TSHE. Shrub layer a dense understory of Rubus spectabilis, with regular covers of FESU, TITRT, CLSI, SARA and RIBR. Site is on a flat terrace within 200' (west) of Huckleberry Creek. Stumps in area = stands previously harvested. Associated species: ALRU, THPL, ABGR, TSHE, RUSP, Festuca subulata, Tiarella trifoliata var.trifoliata, Claytoia sibirica, Sambucus racemosa and Ribes bracteosum. Aspect: 88°. Slope: 5%. Topography: Stream terrace. Light: Partially shaded. Water: Mesic. The site, single thallus, is on a mature leaning ALRU trunk at the east end of an ALRU seral stand with filtered overstory cover and a heavy cover of salmonberry. The PEPA thallus is on the horizontal up-facing side of the trunk in a dense mat of Rhytidiadelphus triquetrus, and below a number of Peltigera britannica thalli. On a mossy-covered leaning live Alnus rubra trunk.

G. Vos GV2010-34, Aug 14, 2010
WTU, Barcode: WTU-L-024997