Apothecia; Habitat: Rocky ridge with Pinus flexilis and Juniperus scopulorum; Location: Just east of US Hwy 310, 9 km NW of Warren; Substrate: Rock; Elevation: 1370 meters; Notes: A. fuscescens det. Knudsen 2010.
Apothecia; Habitat: Festuca idahoensis steppe with dense mat of Selaginella and siliceous cobbles; Location: Bench above Madison River at Palisades Recreation Area, Madison Valley, W side of Hwy 287, 41km S of Ennis; Substrate: Soil and Selaginella; Elevation: 1737 meters.
Spores; Habitat: Festuca idahoensis steppe with dense mat of Selaginella and siliceous cobbles; Location: Bench above Madison River at Palisades Recreation Area, Madison Valley, W side of Hwy 287, 41km S of Ennis; Substrate: Soil and Selaginella; Elevation: 1737 meters.
Habit; Habitat: Rocky ridge with Pinus flexilis and Juniperus scopulorum; Location: Just east of US Hwy 310, 9 km NW of Warren; Substrate: Rock; Elevation: 1370 meters; Notes: A. fuscescens det. Knudsen 2010.
Apothecial section; Habitat: Old Tsuga mertensiana-Abies forest; Location: Rainy Pass toward Cutthroat Pass, Pacific Crest Trail, North Cascades, Okanogan National Forest; Substrate: Bark, fallen conifer log; Elevation: 1650 meters; Notes: Spribille ID of Printzen species as Lecidea cf. rufotheca (unpubl.). Later named M. rufofusca.
Apothecia; Habitat: Old Tsuga mertensiana-Abies forest; Location: Rainy Pass toward Cutthroat Pass, Pacific Crest Trail, North Cascades, Okanogan National Forest; Substrate: Bark, fallen conifer log; Elevation: 1650 meters; Notes: Spribille ID of Printzen species as Lecidea cf. rufotheca (unpubl.). Later named M. rufofusca.
Hymenium; Habitat: Old Tsuga mertensiana-Abies forest; Location: Rainy Pass toward Cutthroat Pass, Pacific Crest Trail, North Cascades, Okanogan National Forest; Substrate: Bark, fallen conifer log; Elevation: 1650 meters; Notes: Spribille ID of Printzen species as Lecidea cf. rufotheca (unpubl.). Later named M. rufofusca.