Observation 60576: Parmelia sulcata Taylor

When: 2010-12-10

Collection location: Briarcrest Neighborhood, Shoreline, Washington, USA [Click for map]

Who: Tim Sage (T. Sage)

No specimen available

I thought Jason had helped me ID this one before but I can’t seem to pinpoint it.

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By: Jason Hollinger (jason)
2010-12-11 03:23:34 CET (+0100)

The network of white markings on the surface that eventually turn into cracks make this Parmelia. When the cracks turn into powdery soredia it narrows it down to P. sulcata and the brand-new P. barrenoae. The way the soredia are produced distinguishes these two. From a distance the noticeable effect is that the lobe tips P. barrenoae generally curl up. The soredia erode more quickly, causing the cracks to widen and pinch the upper surface. Or so I’m told. Some people also look for tiny side-branches on the rhizines underneath (P. barrenoae has them, P. sulcata doesn’t), but good luck with that.

Created: 2010-12-10 20:33:00 CET (+0100)
Last modified: 2010-12-11 03:16:35 CET (+0100)
Viewed: 28 times, last viewed: 2017-06-08 13:33:10 CEST (+0200)
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