Accepted By:
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Crosby, M. R. & o. REVISED. 1999. REVISED: accepted in a monograph, revision, or descriptive flora since 1963. In Checklist Mosses. Missouri Botanical Garden, St. Louis.
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Eckel, P. M., J. A. Hoy & J. C. Elliot. 1997. Pseudocrossidium obtusulum (Pottiaceae, Bryopsida) new to Montana with a key to North American species in the genus. Great Basin Naturalist 57: 259–262.
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Flora of North America Editorial Committee. 2007. Bryophytes: Mosses. Fl. N. Amer. 27(1): i–xxi, 1–711.
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O'Shea, B. J. 2006. Checklist of the mosses of sub-Saharan Africa (version 5, 12/06). Trop. Bryol. Res. Rep. 6: 1–252.
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Zander, R. H. 1993. Genera of the Pottiaceae: mosses of harsh environments. Bull. Buffalo Soc. Nat. Sci. 32. vi + 378 pages.
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