Key to Species: 8
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Racomitrium pacificum ; Hunter Creek, Curry Co., Oregon. DHW m0021.
8a Alar cells thick walled, somewhat porose-nodose, quadrate to short rectangular, yellowish brown to orange, usually distinctly auriculate (caution: auricles easily overlooked because they are often torn and left on the stem when leaves are detached); uncommon; from stream side rocks to dry, rocky hillsides; on rock or soil
Racomitrium pacificum Irel. & Spence
Racomitrium aciculare - Idaho County, Idaho. DHW 802
8b Alar cells weakly differentiated, restricted to basal margins, thin walled, rarely auriculate; inflated only in R. aciculare; leaf cells in section are thickened over the vertical walls and thinner or grooved over the lumens except in R. ryszardii.
Couplet 9
Guide to Racomitrium of Oregon
Created 2007 Northwest Botanical Institute