Observation 218342: Aspicilia contorta (Hoffm.) Kremp.
When: 2015-09-16
(35.7569° -120.2589° 411m)
Who: J-Dar
Herbarium specimen reported

Notes: On weathered sandstone in a semi-arid grassland setting, full sun.

Images

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Apothecial section
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Asci and ascospores
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Iodine blue staining on epihymenium, moving into the hymenium from the left.

Proposed Names

-28% (1)
Recognized by sight
28% (1)
Recognized by sight
56% (1)
Eye3 Eyes3
Based on microscopic features: See comment

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Doesn’t really make any difference in my opinion
By: Jason Hollinger (jason)
2015-12-12 18:51:50 WAST (+0200)

But yes, Nordin et al. spllit Aspicilia up a few years ago, and Esslinger has adopted the new names, so at very least we should add the synonymy to MO.

I’ve shared my opinion about voting down old names and voting up new names, esp. when the name change is purely a recombination and doesn’t affect the interpretation of the taxon in question in the least: it just makes a mess of the voting. But some MO users love to do it anyway. Whatever works for you!

You’re in for a bundle of laughs when you get to the zillion new genera for Caloplaca. Good luck even guessing which genus some of the species belong to. Whee!

New Genus
By: J-Dar
2015-12-12 15:47:02 WAST (+0200)

Looks like this has been changed to Circinaria contorta. What is the convention on MO for deciding when a name change is accepted?

Hmmm…
By: Jason Hollinger (jason)
2015-12-12 04:10:45 WAST (+0200)

Apparently I need to retract my previous comment about globose versus ellipsoid spores. Owe-Larsson et al in Sonoran Flora Vol. 3 claim the primary difference between desertorum and contorta (both present in your area and expected on weakly-calcareous sandstone) is color and thickness of thallus, with desertorum darker/browner and thicker/more convex, and contorta being grayer/greener and thinner/flatter. I thought I remember spores of contorta being rounder, but not according to my notes (or the Sonoran Flora!)

I’m no geologist…
By: J-Dar
2015-12-12 03:22:33 WAST (+0200)

But it was on a large sandstone boulder (car size). Oops, just noticed I didn’t put any info in the notes section when I posted this. So yes, if I’m right that sandstone is generally to some degree calcareous. I didn’t have my KOH with me today and without it I couldn’t coax any spores out of the one section I had time to do. While in the asci, they appear round rather than ellipsoid.

Was this on calcareous rock?
By: Jason Hollinger (jason)
2015-12-12 02:34:08 WAST (+0200)

But I agree that this looks like it has less than 8 spores per ascus — notice that the spores are in a single row: that correlates strongly with the 2-4-spore species — and the areoles look dispersed. Only other options then would be A. destorum (can also be on calcareous rock, but spore size differs, one of the two has subglobose spores, the other ellipsoid) and A. praecrenata (on soil).

Micro added
By: J-Dar
2015-12-12 01:28:36 WAST (+0200)

Ascospores simple, globose, hyaline. Epihymenium yellowish olive. Hymenium I+Blue persistently, ~125µ tall, subhymenium & hypothecium together are 59µ tall (approx).

Created: 2015-10-10 16:41:27 WAST (+0200)
Last modified: 2015-12-12 16:11:25 WAST (+0200)
Viewed: 61 times, last viewed: 2016-10-26 03:33:54 WAST (+0200)
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