Abstract
Taxonomic treatment is presented and 2 new species and a variety of Scapania are described from western North America. A key to the western North American species of the genus Scapania is included. Discussion of the distinguishing characteristics follows the description of each taxon and a distributional list is provided from the specimens examined and from published reports. A total of 20 spp., 3 ssp. and 9 varieties are treated in this work. Among these S. fulfordiae, S. hollandiae and S. subalpina var. muddiae are newly described and S. ornithopodioides is new to North America.

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