Observation 87915: Parmotrema A. Massal.

Growing on the trunk of an Mahagony tree

Species Lists


Underside of thallus
Thallus closeup

Proposed Names

21% (2)
Recognized by sight
56% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


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Black or really dark red?
By: Jason Hollinger (jason)
2012-02-18 20:14:16 CST (-0500)

Probably confirms P. reticulatum. See this key for more info:


NaOH & C tests
By: Richard Greever (rgreever)
2012-02-18 19:48:12 CST (-0500)

NaOH turns thallus yellow, then black. Bleach removes color, turning thallus white.

By: Jason Hollinger (jason)
2012-02-18 14:11:36 CST (-0500)

Definitely Parmotrema s. lat. Chemistry is almost always of critical importance in this group. Fortunately KOH and bleach are almost always enough. I suspect P. reticulatum because it looks like the surface has a fine network of white cracks or thin lines. It would be great to get one of your super close-ups of this in its dry state. :)