Observation 230862: Heterodermia Trevisan

When: 2016-02-05

Collection location: Matinha de Queluz, Sintra, Portugal [Click for map]

Who: zaca

No specimen available

Growing on a rocky wall.
To be compared with the one in observation 230863.


Underside of thallus.

Proposed Names

87% (1)
Recognized by sight

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Add Comment
Hi Jason,
By: zaca
2016-02-07 12:23:22 CST (-0600)

Thanks for the comments.
The question is that I don’t find Heterodermia spp. so often to get the knowledge on how to separate the species. Last week I found one, classified as H. japonica, but growing on tree (observation 230575) . The overall appearance is similar. At this location, I have found almost three years ago specimens classified as H. obscurata, but also on bark. Those never had an intense orange colouration on the underside, maybe the more intense was that in observation 130017. Now, in the present observations one is faintly oranhish and the other is white.

Hold on a second
By: Jason Hollinger (jason)
2016-02-07 11:30:04 CST (-0600)

Is the photo just not showing the orange coloration of the underside very well? At least in eastern USA, H. obscurata is vivid orange below, and the pigment is strongly K+ wine-red, just like a Caloplaca. When I see a faintly orangish-brownish color like this, it’s usually H. casarettiana instead. (Of course, I have no idea which species are present in Portugal, I haven’t been paying close attention to your posts lately… :(

Created: 2016-02-07 10:32:33 CST (-0600)
Last modified: 2016-02-07 10:45:50 CST (-0600)
Viewed: 39 times, last viewed: 2019-05-19 07:38:58 CDT (-0500)
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