Observation 198514: Peziza Dill. ex Fr.

When: 2015-02-11

Collection location: Orinda, Contra Costa Co., California, USA [Click for map]

Who: Richard Sullivan (enchplant)

No specimen available

Growing in bare dirt that had been amended with composted green waste

Species Lists


this paler one was under a plastic tub, so not exposed to the light
spores biguttulate 7-8 × 13-14µm at 1000x
asci tips turn blue in Meltzers
paraphyses thin and dark

Proposed Names

28% (1)
Recognized by sight
9% (2)
Based on microscopic features: spores are biguttulate and 7-8µm x 13-14µm (so they are a little small for P. violacea whose spores rarely show guttulae)
25% (1)
Recognized by sight
Based on microscopic features

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= Observer’s choice
= Current consensus


Add Comment
Not P. praetervisa
By: Nicolas VAN VOOREN (NicoV)
2015-06-27 09:14:06 PDT (-0700)

In the original sense of Bresadola, P. praetervisa is not a “true” violet species and is a synonym of P. petersii. The name has been frequently used after the publication of the book “Fungi of Switzerland” (fig. 49) but among the violet species growing on burnt places, the species illustrated in the book corresponds to Peziza tenacella, characterized by its biguttulate and warted ascospores.
Your collection could be this species, but the use of cotton blue to check the spore ornamentation is required to confirm this hypothesis.