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|I’d Call It That||3.0||6.55||1||(zaca)|
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That spore septum is really wide! Beautiful photos as always. I just got some cotton blue to try, looking forward to it.
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.