Observation 219495: Lecanora caesiorubella subsp. merrillii Imshaug & Brodo
When: 2015-10-13
(35.628° -121.0846° 203m)
Who: J-Dar

Notes: Live oak woodland habitat along Van Gordon Creek. Substrate is Quercus agrifolia bark. Very common.

Thallus thin, yellowish green, irregularly orbicular, without prothallus, K+Y quickly turning red, C-. Apothecia common, lecanorine, superficial, becoming convex, disk pinkish with white pruina, thalline margin thin, algal cells continuous at base of apothecia and continuing into the margins. Hymenium colorless, hypothecium yellowish, exciple thin. Disk C-, K+Y, base of apothecia K+R (norstictic acid). Asci with 8 ascospores. Spores 1-celled, thin-walled, smooth, ellipsoid, no measurements taken.

Update: Apothecia up to 2 mm, more regularly about 1 mm. L. albella is apparently very similar. According to Nash Sonoran Flora: “Chemically, the two species are indistinguishable, but L. caesiorubella generally has larger apothecia and a thicker pseudocortex.” _L. caesiorubella apothecia are described as 0.8-3 mm.

Images

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Mature apothecia becoming convex
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Younger apothecia with raised thalline margins still present.
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Detail of an apothecium showing white pruina over pinkish disk color.
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Apothecial cross-section showing algal layer, colorless hymenium and slightly yellowish hypothecium. (The whole apothecium center looks yellowish and somewhat translucent, but the center part is the hypothecium and it has a little more color than the hymenium at top)
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Spores ellipsoid, 1-celled
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Proposed Names

56% (1)
Eye3 Eyes3
Based on chemical features: Disk C-, K+Y. Apothecia base K+R, thallus K+Y turning Red.
28% (1)
Recognized by sight: Apothecia maybe too large for this species, which are described as 0.3-1.5 mm.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2015-10-17 10:50:51 PDT (-0700)
Last modified: 2015-11-04 06:05:38 PST (-0800)
Viewed: 31 times, last viewed: 2016-10-21 23:58:27 PDT (-0700)
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