Observation 96636: Ochrolechia szatalaensis

When: 2012-06-03

Collection location: Lourinhã, Portugal [Click for map]

Who: zaca

No specimen available

I was not able to determine the genus.


Chemical reactions on thallus;
Chemical reactions on apothecia.

Proposed Names

29% (1)
Based on chemical features
31% (2)
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Recognized by sight

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Add Comment
Good job!
By: Jason Hollinger (jason)
2012-10-15 12:02:17 PDT (-0700)

I think I was interpreting the scale of this observation all wrong. Looking back on it, I can’t imagine how I could have considered anything except for Ochrolechia. (I mean, Micarea, really?? :)

Compare with observation 113417!
By: zaca
2012-10-15 11:26:13 PDT (-0700)

Looking back, there is an incredible similarity of this specimen with
the one in observation 113417 recently posted. Only the one considered here is
younger, its apothecia were just starting to developed, but their form
is the same, and the chemical reactions were a bit weaker, namely the
C and KC. Therefore, I believe that the species could be the same.

I think the next step
By: Jason Hollinger (jason)
2012-06-08 14:21:33 PDT (-0700)

might be to get an ascus stain… but according to the British Flora that’s not really necessary. There are no other crustose genera with:

non-orange thallus or apothecia
discose apothecia with thalline rim
non-warted spores
hyaline hymenium
white C- thallus

I’m stumped. Wait, it looks from the photo that it has a purplish hymenium, can that be?? It doesn’t have any soredia, by any chance, does it? (I don’t see any.) Maybe yours doesn’t actually have algae in the margins (i.e., doesn’t have thalline margin)? There are definitely species of Lecanora with spores that small, but so does Micarea and a bunch of others that lack algae in the margins. The more I think about it, this must be where I’m going wrong: these have got to have biatorine, not thalline, rims…

Assuming nonthalline rims, some options are…

Schaereria – hypothecium brown, asci without apical dome, paraphyses unbranched, hymenium > 90µm

I ran out of time, sorry!

By: zaca
2012-06-08 13:43:09 PDT (-0700)

Neither the section, nor the asci or the cylindrical spores reminds me any Lecanora I’ve ever seen. But, you can always argue that I’ve seen few!

I guess it must be a Lecanora, then
By: Jason Hollinger (jason)
2012-06-08 13:37:17 PDT (-0700)

Lecanora is such a huge and variable genus…

That was also my first thought,
By: zaca
2012-06-08 11:18:42 PDT (-0700)

but the apothecia are too small (less than 0.5 mm).
I also tried the microscopy, but I must say that I didn´t understood what I saw. There were very stranges things, starting from the apothecial section which resembles the lirellae lichens, The asci are of non-standard form (it seems that several asci appear from a common base) and the spores are very dificult to observe, since they are small (~ 11 × 3.7 µm) and hialine, and they seem to be non-septate but I cannot guarantee that.

Were you able to find any spores?
By: Jason Hollinger (jason)
2012-06-07 17:12:24 PDT (-0700)

Sure looks like a thin Ochrolechia but not with those spot tests…

Created: 2012-06-07 15:25:17 PDT (-0700)
Last modified: 2012-10-15 12:01:08 PDT (-0700)
Viewed: 59 times, last viewed: 2017-06-13 00:18:58 PDT (-0700)
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