Observation 10164: Caloplaca cerina (Hedwig) Th. Fr.

When: 2008-06-09

Collection location: Flagstaff, Arizona, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

crust lichen, on shaded/sheltered juniper bark, with (and being overgrown by) Phaeophyscia spp.
THALLUS: medium to dark gray, verruculose, K-, C-
APOTHECIA: lecanorine; rim K- C-; epihymenium with abundant POL+ golden granules, K+ purplish red, C-; hymenium and hypothecium clear; abundant algae in rim and below
SPORE: 8 per ascus, polarilocular with distinct isthmus, 10-12 × 5-7 µm (N=21), septum 2.5-5.0 µm

This matches Caloplaca cerina and Caloplaca pinicola, except that the thallus is not K+ violet.


Apothecial section, in water, at 100×.
Apothecial section, in water, at 100x, in cross-polarized light.
Apothecial section, reacting to KOH, at 100×.
Spores, in KOH, at 1000×.

Proposed Names

58% (1)
Eye3 Eyes3
Recognized by sight
Used references: Nash’s Sonoran Flora
Based on microscopic features: polarlocular spores
Based on chemical features: disc K+ red, C-

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2008-08-29 03:36:44 EDT (-0400)
Last modified: 2008-08-29 03:36:44 EDT (-0400)
Viewed: 37 times, last viewed: 2017-06-05 02:27:51 EDT (-0400)