Observation 113168: Cladonia portentosa (Dufour) Coem.

When: 2012-10-06

Collection location: Mata da Margaraça, Arganil, Portugal [Click for map]

Who: zaca

No specimen available

Axils perforated; Cream soredia covering the branches.

Proposed Names

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Recognized by sight

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Oh wow
By: Jason Hollinger (jason)
2012-10-13 15:29:08 CDT (-0500)

I didn’t realize that photo has such high resolution! You’re absolutely right, that looks exactly like what Brodo describes. (And the few photos I have of such good quality of C. arbuscula/C. mitis are quite different, either entirely uniform, or with a network of white lines but with the “areoles” still being ~smooth.) Neat!

I would say that
By: zaca
2012-10-13 15:22:40 CDT (-0500)

is a perfect discription for what I observed; Please have a look at the center of the first photo with magnification.

By: Jason Hollinger (jason)
2012-10-13 15:12:12 CDT (-0500)

I’ve seen a few sources emphasize textural differences. C. portentosa is covered in “very thin… flocculent patches”. C. mitis has a “smoother, more uniform surface”… “relatively compact and even, not flocculent”; C. arbuscula “very compact, sometimes resembling an areolate cortex, or smooth”. (all from Brodo 2001)

Maybe the “soredia” you saw is from this “flocculent” texture of portentosa?

I looked over all my photos
By: Jason Hollinger (jason)
2012-10-13 15:07:14 CDT (-0500)

C. arbuscula (including C. mitis) has conspicuous gaping axils; C. rangiferina perhaps less conspicuous, but certainly very common; C. portentosa… I didn’t make any notes about the one specimen I’ve seen, but I trust Alan Silverside of course (Brodo doesn’t mention it one way or the other in Lichens of North America). C. subtenuis, on the other hand, has only occasional small pin-prick perforations, and C. evansii virtually none. Brodo claims that C. stellaris also has conspicuous gaping axils.

I’m willing to grant now that the character does seem to be consistent… but it appears to be virtually useless in distinguishing arbuscula, portentosa, stellaris, and rangiferina (my jury is still deliberating rangiferina :). Alas. It was briefly exciting, at least. :)

According to
By: zaca
2012-10-13 09:21:46 CDT (-0500)

Irish lichens and lastdragon the holes in the axils must be of some importance in this group of Cladonia. Both refer it in their short description of the species: Jean Seawright says “Axils often perforate” and Alan Silverside goes further writing “typically with holes in the axils of the main branches”.

I have no experience with C. portentosa
By: Jason Hollinger (jason)
2012-10-12 15:31:26 CDT (-0500)

I’m skeptical of relying too heavily on the size of the open axils, but maybe it really is meaningful in this group of species!

By: zaca
2012-10-12 15:15:58 CDT (-0500)

I didn´t collect a sample, so I will not be able to use UV. Initially I was point towards Cladonia mitis ​​until noticing the existence of open axils though the photos.

Another good one to test UV on
By: Jason Hollinger (jason)
2012-10-11 17:49:37 CDT (-0500)

would help verify the ID.

Created: 2012-10-11 12:03:15 CDT (-0500)
Last modified: 2012-10-13 15:29:18 CDT (-0500)
Viewed: 59 times, last viewed: 2017-06-14 05:46:38 CDT (-0500)
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