Observation 73226: Acarospora A. Massal.

When: 2011-07-28

Collection location: Sintra, Portugal [Click for map]

Who: zaca

No specimen available

Growing on siliceous rock.
Very strong K+ red reaction.


Revisited (the marks of the chemical reactions of the 1st observation were still visible).
Chemical reactions – repetition.

Proposed Names

29% (1)
Eye3 Eyes3
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
OK, understood. Thanks, Jason.
By: zaca
2011-09-02 17:37:25 -03 (-0300)
Didn’t mean those as suggestions for this observation
By: Jason Hollinger (jason)
2011-09-02 17:12:54 -03 (-0300)

Just illustrations of the variability of the genus. Owe-Larsson describes the areoles of the genus as “angular, round or occasionally irregular, slightly concave to flat or ~convex to verrucose”. I’ve seen some very convex all over (not just at margins). I’m just saying that character is insufficient grounds for rejecting the genus. It’s all immaterial if you can’t find any apothecia or perithecia, I guess.

So far …
By: zaca
2011-09-02 17:01:58 -03 (-0300)

you gave me 3 examples of species that I can’t find here and for 2 of them only in the margins the areolas are big. But, in my specimen the dimension of the areolas are constant through the whole thallus. Thus, I doubt.

But Aspicilia will surprise you!
By: Jason Hollinger (jason)
2011-09-02 16:13:51 -03 (-0300)

There are fruticose Aspicilia(!!) (Google A. californica, for example, a worm-like thing that grows in the desert southwest of N. Amer.) I’ve read about species with these big “bullate” areoles. (See the margins of image 24744, for example.) It’s certainly possible.

And it’s perfectly possible it’s something else entirely…

I suppose you mean
By: zaca
2011-09-02 15:41:24 -03 (-0300)

Aspicilia cinerea. But, the areoles are to big and to globose for an Aspicilia. On the left hand side of the first photo of this observation one can see a part of the thallus of an Aspicilia and one infer the difference of size and shape between the two.

Nice sequence!
By: Jason Hollinger (jason)
2011-09-02 15:19:59 -03 (-0300)

Yes, that looks just like norstictic acid. A. cinerea is a good common gray species with norstictic acid.

By: zaca
2011-09-02 08:48:44 -03 (-0300)

I went back to the place and perform new chemical reactions. This time the K reaction developed slowly, it began with a clear yellow phase followed by an intermediate stage of yellow-red and, finally, a bloody red.

By: zaca
2011-08-06 07:55:26 -03 (-0300)

I’m so sure about it as the “could be” of my vote. I proposed Acarospora because of the form of the areoles and a recent experience with a K+ yellow to red reaction in this genus. But, in this case, the red reaction develops very quickly and I not sure of a yellow fase before, although some yellowish tones can be seen in the photo.

Are you sure this is Acarospora?
By: Jason Hollinger (jason)
2011-08-06 00:26:54 -03 (-0300)

The K reaction almost looks like an anthraquinone (unknown in Acarospora)… but maybe there was K+ yellow turning the bright red we see in the photo? (Norstictic acid is apparently known in Acarospora. And many other things, I suppose, too, including Aspicilia, for example, but the spores and paraphyses are totally different.)

Created: 2011-08-05 19:44:19 -03 (-0300)
Last modified: 2011-08-06 07:56:51 -03 (-0300)
Viewed: 75 times, last viewed: 2018-01-06 09:19:41 -02 (-0200)
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