Observation 49812: Caloplaca Th. Fr.
When: 2010-08-04
Who: zaca
No herbarium specimen

Notes: Some particularities of this specimen:
- Living on rock; greenish-grey tallus, apothecia dark-orange with margins of the same color as tallus;
- Chemical reactions:
(a) on tallus – K+ purple, C-, KC+ greenish (like discoloring the K+ reaction);
(b) on apothecia – K+ purple, C+/- red-purple, KC+ purple.

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Recognized by sight
Based on chemical features

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I agree with your assessment
By: Jason Hollinger (jason)
2010-08-07 13:37:18 MDT (-0600)

It’s unusual, but apparently not impossible. I guess if the anthraquinone content is low enough, it won’t be visibly orange, yet still react K+ violet because the K reaction is so strong. Must be some arctic species. I’ve got no literature for saxicolous species in that area. There are some arctic-alpine habitats at the tops of mountains in Arizona, so the Sonoran Flora has many of the common arctic species, but by no means all.

Chemical reactions: photo uploaded.
By: zaca
2010-08-07 12:23:38 MDT (-0600)

Maybe I didn’t describe quite well the chemical reactions.

K+ violet gray thallus?
By: Jason Hollinger (jason)
2010-08-07 11:41:49 MDT (-0600)

That’s odd; I can’t find any such species in the Sonoran Flora. Oh, wait, I see a species (C. pinicola) that grows on bark that has K+ violet gray thallus. Neat, I wonder what this is.

Created: 2010-08-07 06:16:46 MDT (-0600)
Last modified: 2010-08-14 12:38:57 MDT (-0600)
Viewed: 26 times, last viewed: 2016-10-25 01:06:44 MDT (-0600)
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