Observation 10600: Caloplaca trachyphylla (Tuck.) Zahlbr.

This lovely lichen is possibly the most readily visible and noticed in the desert southwest, forming bright orange to red-orange crustose rosettes on rocks of all times, in full sun. The photo does not show the outer lobes, which are important for the positive identifications: they are elongate, convex, and noticeably roughened (use handlens). All parts turn a deep, satisfying wine-red immediately upon application of a drop of KOH.


Close-up of apothecia in center, at 10 or 30×.

Proposed Names

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

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2008-09-07 16:38:30 PDT (-0700)
Last modified: 2008-09-07 16:38:30 PDT (-0700)
Viewed: 14 times, last viewed: 2017-06-05 00:00:27 PDT (-0700)