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|Junior synonym of Formica fusca: Creighton, 1950a PDF: 532; Francoeur, 1973 PDF: 189; Wheeler & Wheeler, 1986g PDF: 16.|
|Status as species: Francoeur, 1977b PDF: 208; Bolton, 1995b: 204; Schär et al., 2018 10.1111/jbi.13380 PDF: 6.|
Found most commonly in these habitats: 7 times found in coastal scrub, 4 times found in pine forest/subalpine meadow, 4 times found in alpine rocky slope, 4 times found in open pine fir forest, 2 times found in rocky ridge crest in conifer forest, 2 times found in shrub steppe, 4 times found in conifer woodland, 2 times found in bristlecone pine forest, 1 times found in exposed coastal prairie, 4 times found in conifer forest, ...
Found most commonly in these microhabitats: 29 times under stone, 8 times nest under stone, 3 times foragers, 3 times ground forager(s), 4 times under dead wood, 3 times on ground, 1 times nest under dead wood, 1 times foraging on exposed soil, 1 times foraging on dry clay by small spring., 2 times strays, 1 times nest in dead wood, ...
Collected most commonly using these methods: 58 times search, 28 times Bay Area Ant Survey (BAAS), 8 times direct collection, 1 times pitfall trap, 1 times Site 88 #1.
Elevations: collected from 10 - 3520 meters, 2098 meters average