Observation 26239: Platismatia glauca (L.) W.L. Culb. & C.F. Culb.
When: 2009-10-04
No herbarium specimen

Notes: Thallus is apple-jade green with white eruptions, sometimes forming near raised veins in broadly foliose section, much like lettuce leaves. Underside comprised of white eroded areas and new growth, becoming buff-brown (similar to brown seaweed), and finally becoming nearly purple-black where holdfasts form. Holdfasts appear to have white cores.

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Eye3 = Observer’s choice
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After comparing to other Platismatia glauca
By: Daniel B. Wheeler (Tuberale)
2009-10-06 01:15:25 CDT (-0400)

including material I have found at this site, I agree with you. Platismatia glauca.

Platismatia glauca
By: smilacina
2009-10-05 15:58:58 CDT (-0400)

looks like a very green Platismatia glauca, or “dirty rag” lichen – the presence of white, brown, and black on the underside is a good clue, and the tattered appearance… this is a very variable and common species, often more greyish white but i’ve seen it quite green before too…

Created: 2009-10-04 23:37:23 CDT (-0400)
Last modified: 2009-10-04 23:37:23 CDT (-0400)
Viewed: 60 times, last viewed: 2016-10-21 23:33:31 CDT (-0400)
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