Observation 12939: Dermatocarpon americanum Vainio

When: 2008-10-15

Collection location: Mount Gleason, San Gabriel Mountains, Los Angeles Co., California, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

On sheltered face of granite boulder.

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Might be the same thing, then.
By: Daniel B. Wheeler (Tuberale)
2008-10-28 17:25:14 CST (-0500)

They looked like someone had left a fingernail impression in brown clay, then arranged the leaves in something of a floral pattern. All leaves raised at the edges, but everything very close to the bark. Then again, might just be an odd configuration of bark peeling.

Dermatocarpon apparently are exclusively on rocks
By: Jason Hollinger (jason)
2008-10-28 03:19:45 CST (-0500)

…but old weathered wood often will support rock species. I’m not sure what else it could possible be. This genus is fairly distinctive (though see Umbilicaria and Lasallia too). They are about 1-4 cm across (according to Brodo), this specimen was around 2 cm wide.

How wide are lobes?
By: Daniel B. Wheeler (Tuberale)
2008-10-28 01:43:12 CST (-0500)

The reason I ask is that I found something amazingly similar on an older Douglas fir on Larch Mtn. last Saturday, but didn’t post it because I didn’t know for sure it was a lichen.

Created: 2008-10-20 01:02:51 CDT (-0400)
Last modified: 2008-10-20 01:02:51 CDT (-0400)
Viewed: 24 times, last viewed: 2017-06-05 04:55:19 CDT (-0400)