Crustose lichen, on granite.
THALLUS: light tan, areolate, margin somewhat indistinct but a little whiter, K+ yellow slowly turning reddish-orange; cortex very thin clear ragged layer on top, brown layer outside fading into clear inside, evenly thickened, strongly POL+ white clearing mostly in K, K+ red needle-like crystals (norstictic acid); algal layer continuous, thick; medulla white, POL+ white persists in K, K+ weakly yellow
APOTHECIA: relatively few, lecanorine, most superficial; disc black, flat, round; rim raised in most, thalline, even; epihymenium brown, POL-, K-; hymenium clear; hypothecium clear; paraphyses strongly moniliform, unpigmented
SPORES: 4-6 per ascus (several asci, never saw more per ascus), clear, simple, broadly elliptical, with big bubble, around 25 × 15 µm, conidia filiform, (25)28+/-2(34) µm (N=14)

This one looked different, since the apothecia were less abundant and mostly superficial, and there appear to be fewer than 8 spores per ascus. However the conidia (unusually long) and chemistry (norstictic acid major) match A. cuprea.


Norstictic acid crystals, in KOH, at 1000x, cross-polarized.
Pycnidial section, in water, at 1000×.
Pycnidial section, in water, at 1000x, cross-polarized.
Conidia, in water, at 1000×.

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora
Based on microscopic features: Long filiform conidia.
Based on chemical features: Cortex K+ red (norstictic acid).

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= Observer’s choice
= Current consensus


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