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Sphagnum crassisetum Brid.
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Gao Chien. 1994. Fl. Bryophyt. Sin. 1. Sphagnales, Andreaeales, Archidiales, Dicranales. 368 pp. Science Press, Beijing.
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Sphagnum patulum Mitt.
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Crum, H. 1984. Part 11: Sphagnopsida, Sphagnaceae. Ser. II, Pp. iv + 180. In N. Amer. Fl., ser. 2,. New York Botanical Garden, Bronx.
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Sphagnum squarrosum var. imbricatum Schimp.
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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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Sphagnum squarrosum var. semi-squarrosum Russow
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Crum, H. 1984. Part 11: Sphagnopsida, Sphagnaceae. Ser. II, Pp. iv + 180. In N. Amer. Fl., ser. 2,. New York Botanical Garden, Bronx.
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