Anonymous, Calif. Fungi
Herbarium of the University of California. [1- ? 1425]

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00432
s.n.
Collybia umbonata Peck

University of Cincinnati, Margaret H. Fulford Herbarium
Catalog #: CINC-F-0006669
Bonar, L. #s.n. 28 November 1937
Caulorhiza umbonata (Peck) Lennox
United States, California, Marin, Phoenix Lake; Phoenix Lake, near Ross

University of North Carolina at Chapel Hill Herbarium
Catalog #: NCU-F-0006529
Bonar, Lee #s.n. 28 November 1937
Collybia umbonata Peck
United States, California, Marin, Phoenix Lake, near Ross, Marin County.