Observation 68743: Punctelia Krog

When: 2010-09-12

Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]

Who: zaca

No specimen available

Recently I decided to go to my “treasure chest of surprises” see lichens that I had noticed in the summer of last year and saw many interesting things. One of them, which never came to watch again, I present in this observation.

Not having found anything similar on sites that usually refer, broaden the search. And I found a very similar specimen in Sharnoff photos, who also had pink stains of the same type that my specimen. I tried a description in the second reference, and found one that fits very well: the pink patches appear to be due to the color of the medulla at the bottom and edges of the lobes. There are two species with a similar description: D. aegialata and D. appalnata, distinguished only by the soredia, more granular with a very thin but distinct cortex in the former and distinctly farinose in the latter. I chose the species with a distribution that includes some areas of Europe (at least it was referenced in the Portuguese islands of Azores: see 3rd reference).


Underside of lobes (top) and chemical reactions (midle and bottom).

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Clearly Jason is right.
By: zaca
2011-06-09 06:21:23 CDT (-0400)

I think that I misread the word “erhizinate” in the description of Dirinaria.

I’d say Punctelia, not Dirinaria
By: Jason Hollinger (jason)
2011-06-07 21:03:08 CDT (-0400)

Key points: it has rhizines (so not Dirinaria), it has holes in the upper cortex (key feature of Punctelia), and upper cortex is not KC+ yellow (else it could be Flavopunctelia, a similar but greener/yellower genus). The thing that bothers me is that the soralia were apparently C-, which definitely should not be the case for this group of species. All the sorediate Punctelia with pale (i.e. not black) underside – P. subrudecta, P. perreticulata, P. missouriensis, P. caseana, P. jeckeri – are supposed to be strongly C+ red. Perhaps it can be weak in some cases? I would guess P. subrudecta, because it doesn’t look strongly ridged enough to be P. perreticulata (and that species I believe is supposed to have mostly marginal soredia).

Created: 2011-06-07 19:11:52 CDT (-0400)
Last modified: 2011-06-09 06:21:59 CDT (-0400)
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