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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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.
Maybe I didn’t describe quite well the chemical reactions.
Created: 2010-08-07 14:16:46 SAST (+0200)
Last modified: 2010-08-14 20:38:57 SAST (+0200)
Viewed: 26 times, last viewed: 2016-10-25 09:06:44 SAST (+0200)