Observation 12952: Caloplaca arenaria (Pers.) Müll. Arg.
When: 2008-10-15
Herbarium specimen reported

Notes: Endolithic crust, on granite.
APOTHECIA: scattered, dark orangish-red, tiny, (0.18)0.36+/-0.08(0.55) mm (N=28), lecanorine; disc some are orange pruinose, flat to weakly convex; rim prominant but thin, lighter; epihymenium dark red, POL+ bright orange, K+ wine red; hymenium clear; hypothecium clear; paraphyses final 1-2 cells expanded, often branched near tips
SPORE: 8 per ascus, elliptical to oblong, clear, polarilocular, (11)13+/-1(16) x (2.2)3.5+/-0.9(5.0) µm (Q=(2.7)4.0+/-0.8(5.3)) (N=14), septum (1.6)2.3+/-0.3(2.7) µm (N=12)

This is the only dark (red instead of orange) endolithic species that grows on acidic rocks (e.g., granite).

Images

26305
26252
26253
at 30x
26254
Apothecial section, in water, at 100×.
26255
Apothecial section, in water, at 100x, cross-polarized.
26258
Apothecial section, in K, at 100×.
26259
Spore, in water, at 1000×.

Proposed Names

92% (2)
Eye3 Eyes3
Used references: Nash’s Sonoran Flora

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-10-19 23:46:17 PDT (-0700)
Last modified: 2008-10-19 23:46:17 PDT (-0700)
Viewed: 57 times, last viewed: 2016-10-25 18:50:15 PDT (-0700)