Conservation Status: Not of concern
Other Ciboria species grow on fruits, acorns, cones, bulbils, or withered leaves. All Ciboria species are brownish, have a slender stalk, and have unicellular, elliptic, hyaline spores.
Sources: Beug, Michael W., Alan E. Bessette, and Arleen R. Bessette. Ascomycete Fungi of North America. Austin, University of Texas Print, 2014.
PNW Herbaria: Specimen records of Ciboria caucus in the Consortium of Pacific Northwest Herbaria database
CalPhotos: Ciboria caucus photos