Observation 77583: Parmelia saxatilis (L.) Ach.
When: 2011-09-25
Who: zaca
No herbarium specimen

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Thanks, Jason.
By: zaca
2011-10-02 20:46:04 EDT (-0400)
I can’t find spore measurements for P. squarrosa
By: Jason Hollinger (jason)
2011-10-02 20:40:04 EDT (-0400)

But the rhizines look like P. saxatilis type, not P. sulcata / P. squarrosa type. P. saxatilis is multiple species (some segregates are already in press), so spore measurements might not be reliable.

New data added.
By: zaca
2011-10-02 18:31:57 EDT (-0400)

I uploaded already two photos, one of the underside and another with the microscopy.
I obtained the following dimensions for the spores: Me = 14.7 × 8.8 µm ; Qe = 1.7 (N=20).

Fence posts can go either way
By: Jason Hollinger (jason)
2011-09-30 14:08:36 EDT (-0400)

Bare weathered wood will often act just like rock as far as lichens are concerned.

Not properly
By: zaca
2011-09-30 14:04:56 EDT (-0400)

on rock, but in a fence dividing properties in the field. I suppose I have a sample of this specimen (not available at this moment) and I will look at it in a few days. Thanks, Jason.

Is this on rock?
By: Jason Hollinger (jason)
2011-09-30 13:53:23 EDT (-0400)

This just looks suspiciously like P. squarrosa. The technical difference is whether the rhizines are merely forked or branched, or whether they are squarrose (lots of tiny side branches, making them look like tiny bottle-brushes). Either species can grow on mossy rock, but P. saxatilis never(?) grows on trees. Chemistry is the same, I believe.

Created: 2011-09-29 18:23:22 EDT (-0400)
Last modified: 2011-09-29 18:23:24 EDT (-0400)
Viewed: 45 times, last viewed: 2016-10-25 16:14:41 EDT (-0400)
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