When: 2007-01-16

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

Who: Jason Hollinger (jason)

No specimen available

Crust lichen, on bark.
THALLUS: dull rimose yellowish, not too thick, cortex not very distinct from medulla, K+ very faint yellow (visible under 30x), KC+ orange (visible under 30x), C+ fleeting orange (very strong on epihymenium)
MEDULLA: can’t distinguish from cortex
ALGAE: green
APOTHECIA: disks buried in smooth-sided warts
SPORES: huge, 2 per ascus, elliptical-oblong, 125 × 40 µm, outer wall 4 µm, inner wall 4 µm, one end has very thin outer wall, conspicuously radially striate, inner wall conspicuously rough

There are four poriform, esorediate, 2-spored Pertusaria listed for the area in Nash, two of which have the C+ orange reaction. The other one, P. pustulata, has smooth inner spore wall and dark epithecium, this one, P. xanthodes has rough inner spore wall and pale epithecium.


Thallus at 30×.
Thallus at 10×.
Spore in water at 1000×.
Spore in water at 1000×.

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora
Based on microscopic features: large spore with rough inner wall
Based on chemical features: K+ yellow, KC+ orange

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= Observer’s choice
= Current consensus


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Created: 2008-10-26 14:06:53 ACDT (+1030)
Last modified: 2008-10-26 14:06:53 ACDT (+1030)
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