Sylloge Fungorum 8: 71. 1889.
Common Name: none
Fruiting body urn to goblet shaped; apothecia 0.5-1.5 cm broad, deeply cupulate, not expanding; margin pallid, crenate, incurved to upturned; fertile surface dull orange-brown to reddish-brown, glabrous; external surface glabrous, dull-brown, fading to pale-buff; stipe 0.3-1.0 cm long, 1.0-2.0 mm thick, straight to curved, the surface dull-brown covered with a white tomentum.
Spores 13.5-18.5 x 6.0-9.5 µm, ellipsoid, some narrowly so, a few oblong, smooth, thin-walled, eguttulate, contents granular; spore deposit not seen.
Gregarious to densely clustered on burnt soil or in campfire pits; fruiting during the spring in the Sierra Nevada and presumably also the coast ranges.
Ediblility unknown; insignificant.
A distinctive goblet shape, crenate cup margin, and habit of growing in burned soil are hallmarks of this attractive Ascomycete. It often fruits in vast numbers along with other fire-associated cup fungi like Pyronema omphalodes, Peziza violacea, P. pratervisa, Anthracobia macrocystis, and Plicaria endocarpoides. Geopyxis vulcanalis differs in growing in soil (not burnt) under conifers, being more urn-shaped, with a yellowish fertile surface.
Breitenbach, J. & Kränzlin, F. (1984). Fungi of Switzerland. Volume 1: Ascomycetes. Verlag Mykologia: Luzern, Switzerland. 310 p.
Dennis, R.W.G. (1981). British Ascomycetes. J. Cramer: Vaduz, Liechtenstein. 585 p.
Medardi, G. (2006). Ascomiceti d'Italia. Centro Studi Micologici: Trento. 454 p.
Seaver, F.J. (1978). The North American Cup-Fungi (Inoperculates). Lubrecht & Cramer: Monticello, N.Y. 428 p.