Observation 402168: Parmotrema A. Massal.

Fruiting on bark of landscape trees. KOH yellow/green then orange. KOH + Cl more reddish and surrounding tissues darkened.


The specimens were rehydrated on damp paper towel overnight before the indoor photos. They looked more gray outdoors on the tree.
After KOH and Cl, yellow/orange liquid

Proposed Names

31% (2)
Recognized by sight
46% (2)
Recognized by sight: Would need to see more of thallus or more developed specimen (maybe something similar to P. tinctorum per broad lobes, but not sure since I see no isidia?? More likely though, Flavoparmeila caperata)

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= Observer’s choice
= Current consensus


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There are some soralia visible
By: Jason Hollinger (jason)
2020-02-18 20:14:46 CET (+0100)

This cannot be Flavoparmelia caperata because the soredia are in narrow elongate marginal soralia. Must be a Parmotrema then. The chemistry is hard to interpret. I agree that on first inspection it appears to be usnic acid KC+ yellow/orange. Ah! I hadn’t read the notes, it is K+ yellow then orange. Phew, okay, that was messing with me. This must be stictic or norstictic or salazinic acid. Definitely Parmotrema. I wonder if it’s maybe P. perlatum. I’m not seeing any cilia. K+ rules out austrosinense.