Observation 88036: Pertusaria pustulata (Ach.) Duby
When: 2011-09-02
Herbarium specimen reported

Notes: Andrew’s specimen 9032011-2; my number 4460.

Growing on bark, maybe hickory. Thallus white and thin; cortex and medulla K+y, C- to C+y in places, KC+o especially around ostioles; cortex UV+ weak orange (350nm); medulla UV-. Spores 1 or 2 per ascus, smooth outer wall.

Distinguished from P. macounii primarily by lack of wavy sculpturing in outer spore wall. Reports of chemistry of the two species are a bit contradictory. Both contain stictic acid (K+y) and some xanthone (C+/- KC+o UV+/- depending on which xanthone).

Note the thin smooth thallus, and the small warts with sloped sides and apparently mostly one apothecium per wart. Compare to P. pertusa, for example, with subglobose warts that are constricted at the base.

Proposed Names

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Based on microscopic features: see notes
Based on chemical features: see notes

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By: Jason Hollinger (jason)
2012-02-20 14:29:02 COT (-0500)

Created: 2012-02-20 04:01:43 COT (-0500)
Last modified: 2012-04-28 02:22:58 COT (-0500)
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