The lichen genus Physcia in North America.

Bibliographic Details
Main Author:	Thomson, John Walter, 1913-
Format:	Book
Language:	English
Published:	Weinheim : J. Cramer, 1963.
Series:	Beihefte zur Nova Hedwigia ; Heft 7.
Subjects:	Physiciaceae. Lichens > North America.

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