Observation 12025: Lecanora muralis (Schreber) Rabenh.

Notes:
Quite a lot on granite outcrops at the top of Mt. Wilson. Forms striking, beautiful greenish, lobate rosettes (sometimes confluent). At first closely-appressed, but in age the center buckles out and often comes off the rock completely. Abundant brownish-yellowish-greenish apothecia packed in the center. Lobe tips are somewhat thickened around the edge making them look a bit concave. Typically waxy in appearance, although it can be pruinose esp. near the tips. Though technically crustose, they often form a rudimentary lower cortex near the lobe tips, making them “honorary foliose” lichens. One of the few (of many many) Lecanora that can be reliably identified in the field.

Images

close-up of thallus, at 10x
Cross-section of a lobe, at 30x — note that the iterruptions in the algal layer are essentially not visible here
Thin cross-section of lobe, in water, at 100×. Interruptions in algal layer are clearly visible here.
Thin cross-section of lobe, in water, at 400×.

Proposed Names

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

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Created: 2008-10-05 17:20:41 CDT (-0400)
Last modified: 2008-10-05 17:20:41 CDT (-0400)
Viewed: 60 times, last viewed: 2019-01-23 09:37:59 CST (-0500)