Observation 91630: Caloplaca crenularia (With.) J.R. Laundon
When: 2012-03-31
Who: zaca
No herbarium specimen

Notes: Growing on siliceous rock. Thallus grey powder. Spores 1-septate with a broad isthmus, of approximate dimensions 17 × 8 µm.

Proposed Names

61% (2)
Eye3 Eyes3
Based on microscopic features
Based on chemical features: K+ purple on apothecia.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Definitely significant
By: Jason Hollinger (jason)
2012-04-03 12:35:11 PDT (-0700)

One of the first couplets in any key to Caloplaca is whether the thallus contains anthraquinones or not. It helps determine which group(s) to consider. It’s particularly subtle in this photo because it blends so perfectly with the substrate! I don’t know if anyone ever looks at these comments when browsing photos on MO, but if so, I thought it’d be nice to bring attention to this feature.

(According to the literature I have access to, I completely agree with your assessment, for whatever that’s worth.)

Is that significant or distinctive?
By: zaca
2012-04-03 11:48:49 PDT (-0700)
Pale gray thallus visible around some apothecia
By: Jason Hollinger (jason)
2012-04-03 11:45:27 PDT (-0700)

Just wanted to make a comment about that because I failed to see it the first time through.

Created: 2012-04-03 11:34:44 PDT (-0700)
Last modified: 2012-04-03 11:45:37 PDT (-0700)
Viewed: 64 times, last viewed: 2016-10-21 20:17:50 PDT (-0700)
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