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When: 2007-01-16

Collection location: Torrey Pines State Reserve, San Diego Co., California, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

Crust lichen, on bark.
THALLUS: light grey to slightly greenish to slightly yellowish at margin, smooth at margin to very thickly verruculose inside, K-, KC- (except where medulla shows through), C-
MEDULLA: white, K-, KC+ pink, C+ pink
ALGAE: green
APOTHECIA: lecanorine, very thick shiny smooth rims, disk very white pruinose, epihymenium brown fading inward to yellow, hymenium clear, hypothecium conspicuously yellow, all K-, epihymenium C+ red, amphithecium filled with lots of small (10-12 µm) crystals, paraphyses narrow and loosely netted
SPORES: 8 per ascus, elliptical, 45 × 25 µm, 1 round cell inside rough greyish stuff, colorless

The key in Nash’s Flora is a bit screwy, and fails because it claims in the key that the medulla is C-, however in the description it says that it is C+ red under the apothecia.


Just a thumbnail.
At 10×.
At 30×.
Spores in water at 1000×.

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora
Based on chemical features: disc and medulla C+ red

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= Observer’s choice
= Current consensus


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