Observation 199052: Caloplaca luteominia var. luteominia

When: 2015-02-16

Collection location: Atascadero, California, USA [Click for map]

35.4514° -120.6437° 280m

Who: J-Dar

No specimen available

Broken calcareous rock in full sun. Rock is full of shell fossils.

Thallus only visible in small areas, if at all (might just be young apothecia). Apothecia with an apparently thick margin slightly raised above disc, lighter in color than disc. K+Reddish-Purple.

So, the key character that I’m not 100% on is apothecia margin characteristics. Some of you can probably tell just from the photos. In Nash V. 3 the apothecia margin should be “thick, raised” vs. “thin, flush”, and these look thick and raised to me which puts it to Caloplaca luteominia.

In Brodo Lichens of NA, it is described as “biatorine” vs. “lecanorine”.

Proposed Names

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Used references: Brodo and Nash

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I agree
By: Jason Hollinger (jason)
2015-02-18 14:15:11 CST (-0500)

I would say that there are at least a few places where there is yellow thallus visible, not just buddi ng apothecia. The margin is tricky. It’s very easy to see on, some of the gray Caloplaca with orange apothecia: the outer rim (the thalline margin) is gray, but the inner rim (proper margin or parathecium) is orange. In section the thalline margin will have algae, and the inner rim will not. This species is supposed to be dominated entirely by the proper margin, that’s why Brodo calls it “biatorine” instead of “lecanorine”. It’s almost impossible to tell from photos, though. You might be able to convince yourself that there are bits of paler yellow thalline material clinging around the base of the rims: that would be all that’s left of the thalline margin. But to be sure you would have to slice it open and see where the algae are found. Both thalline rim and proper margin will be orange and virtually indistinguishable in this case.

Created: 2015-02-17 12:00:53 CST (-0500)
Last modified: 2015-03-01 12:09:46 CST (-0500)
Viewed: 37 times, last viewed: 2017-07-09 19:50:55 CDT (-0400)
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