Observation 15455: Lichen P. Micheli

When: 2008-12-05

Collection location: Sewanee, Franklin Co., Tennessee, USA [Click for map]

Who: Chris Parrish (kitparrish)

No specimen available

Location: 35°13’2.20"N 85°55’18.04"W, el. 544 m. Running Knob Hollow.

These white patches 15-20 cm across are quite common on the sides of sandstone boulders and rock faces along the western rim of the Cumberland Plateau in this area. Their sharp borders suggest an aggressive patch of whitewash dissolving its way through the neighbors.

Note added on 05 mar 2009: The image of Phlyctis ludoviciensis has been moved to its new home, Observation 19162. Thank you, Gary!

Species Lists


original image

Proposed Names

31% (2)
Recognized by sight
22% (3)
Used references: Identification suggested by Gary Perlmutter.
28% (1)
Recognized by sight: I think I see thalline warts in the center, not pustules

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= Observer’s choice
= Current consensus


Add Comment
added original image
By: Chris Parrish (kitparrish)
2020-12-17 18:51:04 CST (-0500)

and a few details of the center and right of center at 300% and 400% to see if the identification might be clearer

two crusts
By: Gary Perlmutter (gbperlmutter)
2009-03-05 20:36:52 CST (-0500)

Image 32357 looks like a Loxospora pustulata and 32359 a Phlyctis ludoviciensis.