Abstract
Dicranum fuscescens f. pallidiseta Bailey is so distinct morphological and ecologically that it is raised to the rank of species. It is a western North American endemic with a chromosome number of n = 12 in the spore mother cells. Its relationship to D. fuscescens is discussed. Recent studies on the genus Dicranum in western North America revealed what was first believed to be a new species. Besides being easy to identify microscopically, the species can also be recognized in the field by its morphology and ecology. This moss had been confused with a common species in the area, D. fuscescens Turn., which appears to be its nearest relative. When sterile, it was some- times confused with D. muehlenbeckii B.S.G., which is rather rare
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