F.K.A.E.J. de Thümen [1-750, plus extras]
University of Illinois Herbarium
s.n.
Phacidium trigonum J.C. Schmidt
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USDA United States National Fungus Collections
s.n.
Phacidium trigonum Thüm.
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University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
A. Fr. Moller s.n. 00 April 1879
Phacidium trigonum J.C. Schmidt
Portugal, bei Coimbra
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