Observation 285038: Acarospora A. Massal.

When: 2017-04-02

Collection location: Santa Rosa Plateau, Riverside Co., California, USA [Click for map]

33.4934° -117.3459° 928m

Who: James Bailey (Silversea_Starsong)

No specimen available

Images

767513

Proposed Names

-28% (1)
Recognized by sight
82% (1)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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That observation (on iNat) looks like something else
By: Jason Hollinger (jason)
2017-08-05 00:12:56 CDT (-0400)

I would guess A. thamnina — shiny and looks like it might be stipitate.

My guess for this observation (A. obpallens) is based on the somewhat “pitted” texture of the nonparasitized areoles. There are also some pruinose areoles scattered about, and A. obpallens is often partially pruinose. But the only way I know to be sure is to verify the presence of gyrophoric acid and hyphal bundles interrupting the algal layer.

Probably best to stick with Acarospora and be happy your day job doesn’t involve Acarospora taxonomy.

From about 200 feet away:
By: James Bailey (Silversea_Starsong)
2017-08-04 22:36:17 CDT (-0400)
Acarospora is a particularly dangerous genus to guess by photo
By: Jason Hollinger (jason)
2017-08-04 22:32:25 CDT (-0400)

But I would look first at A. obpallens. The blackened coloration on many of the squamules is probably a parasite (there are several Lichenostigma that turn various species of Acarospora black). So pay more attention to the pale brown areoles. They’re probably closer to what it’s “supposed to” look like.

I think this was on harder soil or perhaps granite, yeah
By: James Bailey (Silversea_Starsong)
2017-08-04 22:09:21 CDT (-0400)

It was on the ground with the Acarospora schleicheri and Trapeliopsis.

Is this on soil?
By: Jason Hollinger (jason)
2017-08-04 22:03:26 CDT (-0400)

Or “rotten granite”? There are some terricolous Acarospora which might fit.

Created: 2017-08-04 19:26:18 CDT (-0400)
Last modified: 2017-12-03 10:18:32 CST (-0500)
Viewed: 41 times, last viewed: 2017-12-03 14:21:48 CST (-0500)
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