Observation 49225: Dermatocarpon miniatum (L.) W. Mann

Growing in crack in dry granite, sheltered from the sun, at 3500m elevation with Pleopsidium and Caloplaca sp.

[admin – Sat Aug 14 01:59:49 +0000 2010]: Changed location name from ‘Darwin Canyon, Inyo County, California, USA’ to ‘Darwin Canyon, Death Valley National Park, Inyo Co., California, USA

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By: Jason Hollinger (jason)
2010-07-27 11:52:16 CDT (-0500)

There are only two (common) genera at all like this (flakes only attached to the rock by a single point in the middle): Umbilicaria and Dermatocarpon. Most Umbilicaria are dark brown with black apothecia (U. americana is a notable exception, but it is also usually quite large and with copious black “rhizines” underneath). Dermatocarpon generally is smaller and “uglier” and looks a lot like this. The most common Dermatocarpon species by far (as far as I can tell) is D. miniatum. The differences between species still seem overly subtle to me. [Edit: sorry, forgot to mention that Dermatocarpon has perithecia instead of apothecia — immersed flask-shaped fruiting structures that appear on the surface like tiny blackish dots.]

Created: 2010-07-27 07:05:55 CDT (-0500)
Last modified: 2010-10-07 05:37:21 CDT (-0500)
Viewed: 36 times, last viewed: 2017-06-07 21:22:11 CDT (-0500)
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