Observation 92747: Peltigera collina (Ach.) Schrad.
When: 2012-04-07
Who: zaca
No herbarium specimen

Notes: These specimens were growing on bark of ash trees. I was not expecting to see a Peltigera on the bark of a tree.
In the field first I thought that these were Nephroma, but since I collected a sample I realize that the it must be a Peltigera, due to the existence of bushy rhizines. This together with the marginal soralia and
wavy or undulating margins, which gives to this lichen a distinctive appearance, clearly points to Peltigera collina, since the is the only (?) Peltigera growing on trunks of trees and not at the base. There is still some doubts related to the form of the rhizines, I think that the references are contraditory in that respect, but I believe that Peltigera collina is the species of these specimens.

Proposed Names

28% (1)
Recognized by sight: tomentose upper surface, abundant phyllidia or dactyls, extremely squarrose rhizines

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Eye3 = Observer’s choice
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Comments

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Yes, the rhizines …
By: zaca
2012-04-14 13:49:59 PDT (-0700)

do not fit with the descriptions I saw (see my comments on the notes and that’s the reason for a so long list of references). Concerning the question about tomentum or pruina, I considered it as pruina, since I saw no tomentum with the hand lens on the sample of a sample I collected.

Hold on a minute
By: Jason Hollinger (jason)
2012-04-14 11:56:16 PDT (-0700)

Is that pruina or tomentum at the tips?? Just looked at your next observation, you have a clearer photo there, and it looks like pruina. Sorry. Yes, I still agree that the rhizines look wrong (that group should have short tufted rhizines not squarrose), but I also agree that P. collina sounds a lot better if you interpret it as pruinose instead of tomentose.

Unusual specimen
By: Jason Hollinger (jason)
2012-04-14 11:47:38 PDT (-0700)

This is clearly tomentose on the upper surface, ruling out collina, unfortunately. I would call it “dactylate” or even phyllidiate, not sorediate. It doesn’t key out in any of my literature. P. fibrilloides sounds similar, but it’s Central and South American and I’ve never seen it.

Created: 2012-04-14 07:44:45 PDT (-0700)
Last modified: 2012-04-14 11:52:17 PDT (-0700)
Viewed: 39 times, last viewed: 2016-10-22 09:02:14 PDT (-0700)
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