Observation 12937: Physcia biziana (A. Massal.) Zahlbr.

Notes:
This is a very common Physcia in these mountains, on both oak bark and less common on granite. Recognize by abundant apothecia and heavy coarse pruina.

Foliose lichen, on granite, fairly exposed, with Lecanora muralis.
THALLUS: light gray, coarsely white pruinose, K+y, white underneath with white simple rhizines
MEDULLA: white, K-
APOTHECIA: lecanorine, black, densely coarsely white pruinose, substipitate, to 2 mm wide, flat

Images

26335
26191
26192
26193
at 30x
26194
at 30x, showing K+y spot test

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Nash’s Sonoran Flora
Based on chemical features: Cortex K+ yellow, medulla K-.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-10-20 01:00:41 EDT (-0400)
Last modified: 2008-10-20 01:00:41 EDT (-0400)
Viewed: 105 times, last viewed: 2018-04-12 07:55:30 EDT (-0400)