When: 2010-11-07

Collection location: Dabney Creek, Madison Co., Arkansas, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

on exposed limestone boulder above waterfall

I had trouble matching photos to specimens, so this might “just” be the far more common P. reticulatum. The appropriate couplet from Harris & Ladd’s keys is:

Upper cortex lacking a reticulate pattern; soralia round, delimited, prevailingly on short marginal lobes; lower cortex with a distinct marginal zone free of rhizines . . . P. margaritatum

Portions of the upper cortex with reticulate pattern of cracks and/or maculae; soralia linear and marginal to laminal and diffuse, not prevailingly on short marginal lobes; rhizines usually present to margin of lower cortex . . . P. reticulatum

It can be hard to diagnose this “reticulate pattern of cracks” from photos, so I don’t think it’s possible to be certain of the ID of this particular photo. I definitely collected both species from this location, though.


Proposed Names

58% (1)
Used references: Preliminary keys to Ozark lichens (Harris & Ladd 2005)
Based on chemical features: medulla K+ yellow to blood red (salazinic acid)

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= Observer’s choice
= Current consensus


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