Observation 87915: Parmotrema A. Massal.
When: 2012-02-17
No herbarium specimen

Notes: Growing on the trunk of an Mahagony tree

Proposed Names

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

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Black or really dark red?
By: Jason Hollinger (jason)
2012-02-18 17:14:16 PST (-0800)

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


NaOH & C tests
By: Richard Greever (rgreever)
2012-02-18 16:48:12 PST (-0800)

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

By: Jason Hollinger (jason)
2012-02-18 11:11:36 PST (-0800)

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. :)

Created: 2012-02-17 17:59:25 PST (-0800)
Last modified: 2012-02-18 16:51:47 PST (-0800)
Viewed: 30 times, last viewed: 2016-10-21 23:48:08 PDT (-0700)
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