[f. sphagn-, SPHAGNUM: see -OLOGIST.] A special student of, or authority on, the sphagna.

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1886.  Jrnl. Roy. Microsc. Soc., VI. 108. The very great diversity displayed by different sphagnologists in the limitation of species.

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  So Sphagnology, the special study of the sphagna (Cent. Dict., 1891).

3