Observation 78053: Peltigera Willd.

When: 2011-09-24

Collection location: Serra de São Mamede, Portugal [Click for map]

Who: zaca

No specimen available

Observations MO78051 to MO78055 refer to species of Peltigera. Some are very similar, but others not so much. Some were separated in the field by hundred of meters and others by miles.



Proposed Names

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see discussion under observation 80959
By: Jason Hollinger (jason)
2011-11-05 19:17:25 GMT (+0000)

Summary: This is a very diminutive species; the scale was not made apparent until seeing it side-by-side with genuine P. praetextata (or at least, what I take to be genuine praetextata!) in the other observation. I suggest considering P. monticola, a very small rufescens-like species with discrete rhizines and abundant phyllidia. (Used Vitikainen’s treatment in the Sonoran Flora, Vol. II).

I find P. ponojensis very problematic
By: Jason Hollinger (jason)
2011-10-05 23:31:48 BST (+0100)

Even with specimen in hand, I continue to get it wrong from time to time. It is especially easy to confuse with P. rufescens and P. praetextata. I think there may be no good alternative to sending your specimens to one of the (few) experts in the genus for verification while learning. Better yet, go for a walk with said expert! :) It’s a very difficult genus, maybe one the most difficult of the macrolichen genera, right up there with Cladonia, Hypogymnia and Collema!

These observations …
By: zaca
2011-10-05 23:01:35 BST (+0100)

gave me a lot of work, but at the end worth it and I’m happy with that, dispite of the problem of multiple specimens in one of the observations.
As you said in your comment the species P. ponojensis can’t be ruled out. It does not appear in Portugal checklist (no meaning), but it appears in the checklist of our neighbor Spain and the place of the observation was very close to the border of the two countries. I saw already some photos of this species, which I never heard, and there are many similarities.
Thanks, Jason!

I agree again
By: Jason Hollinger (jason)
2011-10-05 20:54:50 BST (+0100)

P. praetextata is extremely variable. This is a good example of one extreme form which looks almost like a phyllidiate rufescens or ponojensis. The margins are mostly ascending, except where they are curled down at the lobe tips. But the veins are distinct and the rhizines remain discrete and ropy even back from the margins (ruling out rufescens for sure, but not ponojensis).

Created: 2011-10-05 11:55:07 BST (+0100)
Last modified: 2011-11-05 19:15:05 GMT (+0000)
Viewed: 42 times, last viewed: 2017-06-10 05:19:50 BST (+0100)
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