Abstract
Racomitrium ryszardii Bedn.-Ochyra from western North America is described and illustrated. It belongs to subg. Cataracta Vilh. sect. Stenotrichum (Chev.) Bedn.-Ochyra and is closely related to R. aquaticum (Schrad.) Brid. with which it constitutes subsect. Hydmphilum Bedn.-Ochyra. It differs from R. aquaticum in its keeled, linear-lanceolate leaves, the absence of a basal marginal row of pellucid cells, a cristate leaf apex, long costa extending almost to the apex, an anatomical structure of the costa and longer peristome teeth. It is a hydrophytic moss growing from sea-level to subalpine elevations on outcrops and boulders near streams through the coastal coniferous forest from north Oregon to south-eastern Alaska. All collections of R. ryszardii have formerly been reported from the Pacific Northwest as R. aquaticum and the only exception is the specimen from Montana which has not been available for examination. The only record of the latter species from eastern North America is also based on misidentification, and the voucher specimen actually belongs to R. sudeticum (Funck) Bruch & Schimp. Accordingly, R. aquaticum must apparently be withdrawn from the moss flora of North America, unless the specimen from Montana represents this species,
Published Version
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