Cummings, Williams & Seymour: Lich. Bor.-Amer.Francis W. Pennell [1-280]
Oregon State University Herbarium
Thos. A. Williams #N.A.L. 76. 00 December 1896
Cladonia gracilis subsp. verticillata
United States, Maryland, Montgomery, Takoma Park; Takoma Park
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