Observation 106189: Parmotrema A. Massal.
When: 2012-08-20
No herbarium specimen

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By: Jason Hollinger (jason)
2012-08-20 19:20:49 BST (+0100)

I think. It has those broad rounded lobes and general look of a Parmotrema. Since it is fertile and lacking (?) soredia or isidia, that leaves only these two species. KOH on the inner medulla would distinguish the two species: P. performatum is K+ yellow to deep blood-red quickly; P. michauxianum is K-. (Also you might verify that it doesn’t have a dense network of fine little cracks all over the upper surface, which would indicate Rimelia cetrata.)

Created: 2012-08-20 15:46:50 BST (+0100)
Last modified: 2012-08-20 18:10:30 BST (+0100)
Viewed: 11 times, last viewed: 2016-10-16 09:38:58 BST (+0100)
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