Observation 300103: Caloplaca Th. Fr.

When: 2017-11-18

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

Who: zaca

No specimen available

Growing on siliceous rock.


Microscopy: Apothecial section (x100, in water);
Microscopy: Apothecial section in KOH (x100 and 400);
Microscopy: Hymenium (x400, in Lactophenol blue);
Microscopy: Hymenium (x400, in Chloral and Lactophenol blue);
Microscopy: Asci and paraphyses (x1000, in Chloral and Lactophenol blue);
Microscopy: Asci and paraphyses (x1000, in Chloral and Lactophenol blue).

Proposed Names

87% (1)
Recognized by sight

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= Observer’s choice
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Add Comment
Distinctive micro too
By: J-Dar
2017-12-18 00:16:16 CST (+0800)

That spore septum is really wide! Beautiful photos as always. I just got some cotton blue to try, looking forward to it.

Microscopy added.
By: zaca
2017-12-17 18:39:45 CST (+0800)

Spores polarilocular with septa too large for C. arenaria, ruling out this species. The septum is even to large for C. atroflava and fits well in C. crenularia. All the other micro characters fit well in this latter species , as can be seen here:
There we can also see that there are specimens with dark grey thallus of this species. So, if I had to choose I will go for C. crenularia.

I would love to know which species exist here.
By: zaca
2017-11-27 00:02:51 CST (+0800)

I presume that both you mentioned exist here. In this case, the second mentioned is a good candidate; see here
Thanks, J-Dar.

Are there several species with gray thallus on rock?
By: J-Dar
2017-11-26 23:45:05 CST (+0800)