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sum(score * weight) /
(total weight + 1)
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).
Bare weathered wood will often act just like rock as far as lichens are concerned.
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.
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 15:23:22 PDT (-0700)
Last modified: 2011-09-29 15:23:24 PDT (-0700)
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