Observation 10255: Caloplaca arizonica H. Magn.
When: 2008-06-24
Herbarium specimen reported

Notes: crustose lichen, on sheltered juniper bark
THALLUS: areolate, pale yellow, K- (or very weakly reddish), C-
APOTHECIA: dark orange; rims thalline but often with pigment bleeding over from discs; epihymenium and cortical pigments K+ blood red, C+ red, POL+ golden, soluble in K; hymenium IKI+ blue; paraphyses branched near tips, last 2-3 cells inflated
SPORES: 8 per ascus, polarilocular, 13+/-2 × 6.5/-1.2 µm (Q=2.0/-0.3) (N=15), septum 4.1+/-0.8 µm thick

This was quite common in the area. Color of the thallus varies anywhere from bone-white to lemon yellow to slightly orangish yellow. Color of the apothecia varies from bright orange to dark orange to almost brown. Treatment in Nash calls it “dark reddish orange”, and claims thallus should be K+ red, but I did not find this to be true. It is possible the pigment bleaches out of the thallus with exposure.

Images

19102
10x magnification
19103
30x magnification
19104
10x magnification
19105
30x magnification
19106
Apothecial section, in water, at 100×.
19107
Apothecial section, in water, at 100x, in cross-polarized light.
19108
Apothecial section, reacting nicely in KOH, at 100×.

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Nash’s Sonoran Flora

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-08-31 11:52:59 PDT (-0700)
Last modified: 2008-08-31 11:52:59 PDT (-0700)
Viewed: 35 times, last viewed: 2016-03-20 14:09:39 PDT (-0700)