Ahti T.
(1978):
Two new species of Cladonia from western North America,
Bryologist,
81: 334-338
Cladonia thomsonii Ahti, sp. nov., is reported from Alaska, the Canadian Northwest Territories and the Soviet Wrangell Island. Cladonia ver- ruculosa (Vain.) Ahti, comb. nov., ranges from Alaska to Oregon. Cladonia wainii Sav. and C. rangiformis Hoffm. are excluded from the North American flora
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