Observation 102509: Aspicilia cyanescens Owe-Larss. & A. Nordin
When: 2012-07-20
(34.225° -118.1284° 967m)
Herbarium specimen reported

Notes: HABITAT chaparral on west slopes; SUBSTRATE Rs under Quercus; ASPECT partly sunny; NOTES pure gray thin areolate crust with dark gray prothallus at margin, cortex and medulla K-, apothecia flush and black and epruinose, margins of apothecia concolorous with thallus and not raised, epihymenium green turning brownish-green in K, paraphyses moniliform with 5-7 swollen cells, medulla POL+ slightly not clearing in K; SPORES 8 per ascus, ~25 × 15 µm, conidia ~15-25 × 1 µm linear.

How exciting to finally find (and successfully collect!) good fertile material so I could put a confident name on this thing. The key in Sonoran Flora vol. III emphasizes the bluish coloration of the thallus, prothallus and epihymenium, something I have never observed in any of the dozen or so specimens I’ve collected. Yet, now that I have good spores and conidia, there can be no question of the ID.

This is the most common species of Aspicilia in shaded, forested canyons of the front range of the San Gabriel Mountains. All those gray featureless stains on smooth bare granite are (apparently) this thing.

Images

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Apothecial section, in water, at 100×.
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Apothecial section, in water, at 100x, cross-polarized.
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Apothecial section, in K, at 100×.
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Conidia, in water, at 400×.
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Thallus interior, at 30x, stacked.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2012-07-23 09:34:59 AST (+0300)
Last modified: 2012-07-23 09:35:05 AST (+0300)
Viewed: 33 times, last viewed: 2017-02-04 04:01:25 AST (+0300)
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