Observation 269851: Lecanora Ach.

When: 2017-02-13

Collection location: Round Valley Regional Preserve, Contra Costa Co., California, USA [Click for map]

Who: Pgrunow

No specimen available

Notes:
crustose lichen with blackish apothecia

Images

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Comments

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Thought it looked off-white in the field
By: Pgrunow
2017-02-16 20:26:05 CET (+0100)

But I could be wrong. I appreciate the effort, though!

It could be any of these things!
By: Jason Hollinger (jason)
2017-02-16 20:21:40 CET (+0100)

We’re just playing the “let’s see who can guess what it is based on virtually no taxonomically useful information” game. Color of apothecia is about all we have to go on here, and it is a poor taxonomic character at best. My instinct is that this is too dark for L. campestris, slightly too dark for L. pseudistera (although I have specimens of the latter which look almost identical), the thallus is too poorly developed for all of the above, but especially L. gangaleoides and L. argentea and Tephromela (particularly the apothecial rims are too thin), so I’d tentatively rule those out. The off-white coloration of the thallus is odd, like maybe that should be a clue. But I don’t know what it would suggest. Maybe it just suggests a strange effect of white-balancing in the camera, and that’s all. Lastly, it seems far too extensive and well-developed to be Rinodina bolanderi. Although, R. confragosa does reach these proportions regularly, but it is typically a shaded species. … Who knows. :(

Pseudistera supposedly has dark reddish brown apothecia
By: Pgrunow
2017-02-16 20:03:55 CET (+0100)

The apothecia are certainly dark, but I am surprised at that description.
Why isn’t this L. Campestris?
Bolanderi is the closest rinodina I found, but it doesn’t seem quite right.