Habitat is old growth oak forest dominated by Quercus agrifolia, but also with interesting associates including madrone (Arbutus menziesii), lots of California bay (Umbellularia californica) and much less common this far south, tan oak (Lithocarpus densiflorus). Location is the ridge top overlooking the town of Cayucos, just on the shady east side of the ridge.

Substrate is Quercus agrifolia branch.

Thallus white, somewhat thick, C-, K+Y. Apothecia lecanorine, crowded, yellowish white in maturity, densely mealy pruinose, disk C+Y, K-, but margin C-. Medulla appears C-; algal layer continuous in apothecial cross-section, somewhat discontinuous in mature material. Disks and thallus UV-.


K+Y thallus on left, C+Y apothecia disks on right.

Proposed Names

-62% (2)
Used references: Brodo 1990 Corticolous Ochrolechia of NA
Based on chemical features: Apothecia disk UV+Y
84% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
You’re in good company, don’t worry!
By: Jason Hollinger (jason)
2015-12-11 17:34:29 CET (+0100)

Sigridea californica is also strikingly similar on the surface (but C-). It’s so easy to be totally wrong about something even if you’re totally confident! In this case spore size and ascus type would presumably caught the mistake eventually.

Not even the right genus?!
By: J-Dar
2015-12-11 05:38:51 CET (+0100)

Dang! I got fooled by the pruinose disks and chemistry. Thanks Jason!

Very common on CA coast
By: Jason Hollinger (jason)
2015-12-10 17:54:05 CET (+0100)

Created: 2015-12-10 04:43:27 CET (+0100)
Last modified: 2016-01-30 21:49:27 CET (+0100)
Viewed: 68 times, last viewed: 2018-08-15 00:09:36 CEST (+0200)
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