Observation 85749: Parmelia saxatilis (L.) Ach.
When: 2011-12-25
Who: zaca
No herbarium specimen

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Aha, never mind, then!
By: Jason Hollinger (jason)
2012-01-06 18:06:18 PST (-0800)
Maybe there exists
By: zaca
2012-01-06 16:19:34 PST (-0800)

a similar species in europe which is similar to P. saxatilis but is not P. hygrophila, because according to the description in “CNALH” such species has as world distribution: Pacific NW in North America down to southern California.

Ideally you should note whether it has squarrose rhizines
By: Jason Hollinger (jason)
2012-01-06 10:56:17 PST (-0800)

This looks like P. saxatilis to me, too, but it’s not always easy to distinguish it from P. hygrophila from a distance. In P. saxatilis the rhizines have many short perpendicular side-branches (and these are sometimes further branched); in P. hygrophila the rhizines are simple or fork a few times. The trick is that the outer rhizines (the ones visible in photos like this) are often all simple in both species. It can be hard to locate good clear examples of squarrose rhizines in some specimens with just a hand lens.

Created: 2012-01-05 14:25:38 PST (-0800)
Last modified: 2012-01-05 14:25:41 PST (-0800)
Viewed: 23 times, last viewed: 2014-07-18 12:38:39 PDT (-0700)
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