Cummings, Williams & Seymour: Lich. Bor.-Amer.Francis W. Pennell [1-280]
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Oregon State University Herbarium
Catalog #: 51276
Thos. A. Williams #N.A.L. 287 01 May 1898
Placidium arboreum (Schwein. ex E. Michener) Lendemer
United States, Maryland, Sligo Creek
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