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As defined in the present work, the Pacific Northwest includes Washington, Oregon, Idaho, weatern Montana, Wyoming, and the Canadian Provinces of British Columbia and Alberta through the Rocky Mountains and north to about the fifty-second parallel. A total of 598 species and varieties of mosses are known from these states and provinces, but the keys include a few additional taxa for which there are unverified reports. Vegetative characters have been used whenever possible in the key dichotomies because many collections are sterile or have immature capsules.
General Keys(1-5)
Key 1. Introductory Key
Kye 2. Acrocarpous Mosses,the Leaf Cells Papillose, Mammillose, or with Cuticular Ridges
Key 3. Acrocarpous Mosses with Smooth Leaf Cells
Key 4. Pleurocarpous Mosses, the Leaves Ecostate, or the Costa Short, Double, or Both
Key 5. Pleurocarpous Mosses with Unicostate Leaves, the Costa to the Middle of the Leaf or Longer
Key 6. Sub-classes
Key 7. Andreaea
Key 8. Tetraphidaceae
Key 9. Buxbaumiaceae
Key 10. Buxbaumia
Key 11. Polytrichaceae
Key 12. Atrichum
Key 13. Oligotrichum
Key 14. Pogonatum
Key 15. Polytrichum
……
Key 110. Orthothecium
Key 111. Plagiotheciaceae
Key 112. Isopterygium
Key 113. Plagiothecium
Key 114. Hypnaceae
Key 115. Hypnum
Key 116. Rhytidiaceae
Key 117. Rhytidiadelphus
Key 118. Hylocomium
Glossary
Index
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