Observation 113089: Peltigera didactyla (With.) J.R. Laundon
When: 2012-10-05
Who: zaca
No herbarium specimen

Notes: Very tiny specimen consisting only on scattered small groups of upturned lobes. The upper side is pale brown and has soralia and soredia on it; the underside is withish (near the margins of lobes) to pale brown, with veins and simple short rhizines; the underside also has some tomentose zones almost resembling cyphellae, characteristic of the genus Sticta. I was not able to find any Peltigera species with these features, though I quite sure about the genus, and the most closely I saw was Peltigera didactyla despite of the color of thallus.

Proposed Names

58% (1)
Recognized by sight
84% (1)
Used references: T. Goward & J. Miadlikowska; both cited the rhizines as the critical character

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Thanks for the invitation,
By: zaca
2012-10-10 16:42:31 PDT (-0700)

but for the moment and near future that is out of question. Certainly the place is magnifique to observe Peltigera spp..

Same thing here in southern California
By: Jason Hollinger (jason)
2012-10-10 14:15:18 PDT (-0700)

It’s really hard to make progress in Peltigera until you have a chance to visit the boreal forests. They are so rare and distorted and limited in these Mediterranean environments. Ever consider taking a vacation to British Columbia? :) Trevor Goward has a lovely place situated in the global center of diversity for Peltigera. Lichenologists are always welcome.

I will not,
By: zaca
2012-10-10 13:46:09 PDT (-0700)

at least until I understand a bit better this genus. Unfortunately I have not many opportunities.

Don’t lose patience yet!
By: Jason Hollinger (jason)
2012-10-10 12:50:51 PDT (-0700)

Not that you will. You’ve proven that repeatedly. Peltigera is a very difficult genus. As you can see from this case(!), even though this is the one single genus I know better than any other, I still get totally confused regularly.

The good new is that,
By: zaca
2012-10-10 11:54:23 PDT (-0700)

in this case, I was in the right direction; the bad new is that still is very different from what I saw of P. didactyla and all these Peltigera spp. make me mad. Thanks, Jason.

This is a very odd form…
By: Jason Hollinger (jason)
2012-10-10 11:18:02 PDT (-0700)

… but it has to be P. didactyla. So far as I know only P. didactyla, P. extenuata, and P. castanea have laminal soralia like this. P. extenuata has never been observed with apothecia (I’m pretty sure), and it should have branched bushy rhizines. P. castanea is a very rare thing known only from a few locations in British Columbia and the Alaskan panhandle. But I’m concerned that it has such well-developed elongate lobes. That is well outside the described variation of the species.

Created: 2012-10-10 10:46:28 PDT (-0700)
Last modified: 2012-10-10 12:48:51 PDT (-0700)
Viewed: 58 times, last viewed: 2016-10-21 13:53:18 PDT (-0700)
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