Observation 85427: Heterodermia speciosa (Wulfen) Trevisan

When: 2011-12-31

Collection location: La Barque Creek, Missouri, USA [Click for map]

Who: Patrick Harvey (pg_harvey)

No specimen available



Proposed Names

-29% (1)
Recognized by sight: Not really.
28% (1)
Recognized by sight: see comment

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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My first guess
By: Jason Hollinger (jason)
2011-12-31 16:18:48 PST (-0800)

would be Heterodermia speciosa, but the brownish color is suspect. If you could look more closely at the underside, it would help a great deal. Strictly speaking, you should rule out Physconia (black squarrose rhizines), Phaeophyscia (dark, corticate underside), and other species of Heterodermia (could be orangish, yellowish, brownish, grayish, purplish, etc. and either corticate (H. speciosa) or more often decorticate (“webby” / roughened / minutely cottony; almost all the other species present in that area). The soredia on reflexed lobe tips strongly suggests Heterodermia, though, and the small white cilia-like rhizines visible from above strongly suggest H. speciosa. K test on the upper surface should be pale yellow (also ruling out Physconia and Phaeophyscia).

Created: 2011-12-31 15:40:56 PST (-0800)
Last modified: 2012-01-02 11:28:36 PST (-0800)
Viewed: 21 times, last viewed: 2018-06-07 15:42:24 PDT (-0700)
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