Key to Species: 5
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Racomitrium ryszardii; Marys Peak, Benton Co., Oregon. W.B. Schofield 112133.
5a All leaves muticous, without trace of hair point, generally lacking even a single differentiated apical cell; seta always with a left handed twist; in section the costa abaxially rounded or flat at midleaf (note: if back of costa is ridged or winged, see Grimmia ramondii)
Couplet 6
Racomitrium occidentalis; Mt Baker-Snoqualmie National Forest, Washington. R. Lesher 2687a.
5b Some or all leaves with a long or short hair point or at least sharply pointed with one or more distinct, differentiated, elongate, apical cells; seta with left handed twist except Racomitrium lawtoniae (note: if seta has a right handed twist, see Grimmia); distal half of costa generally rounded abaxially but grooved in R. occidentale
Couplet 13