Palustriella falcata (Brid.) Heden.

Montana: Sanders County: About 9 air miles NW of Plains, above Roundhorn Wildlife Mgmt Area. Lolo National Forest.
47.5388° N, 115.0529° W,
Uncertainty: 20 meters. "Mapped from specimen's GPS coordinates, which matched with auxiliary locality information. Standard 20 m uncertainty applied unless auxiliary information suggested otherwise."
Midslope, SSW aspect, 50 degree slope. At isolated calcareous spring. Plants pendant from saturated, mineral-coated cliff face. In open, shrubby conifer forest with Pinus ponderosa, Pseudotsuga menziesii, Betula occidentalis, Cornus sericea, Acer glabrum, Hymenostylium recurvirostrum, and Fissidens grandifrons.

Craig T. Odegard 238, Feb 25, 2015
MONTU, Accession: 164033