Ginny B's picture

Caloplaca crenularia?

Observed: 10th June 2012 By: Ginny B
S159 Neighbourhood Nature - course complete
Ginny B’s reputation in Fungi and LichensGinny B’s reputation in Fungi and LichensGinny B’s reputation in Fungi and Lichens
Caloplaca crenularia?
Grey and red lichen
Grey and red lichen on bridge

Grey thallus, brick red apothecia on the large patch. On the two smaller patches to the right the red is darker and more like dried blood in colour. Sorry, I can't take closer-up pictures of the apothecia.


Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.


AlanS's picture

Strictly speaking ...

it is safest to confirm C. crenularia by examination of a cross-section of an apothecium under the microscope (the related C. ceracea has an algal layer), but what I can see of the apothecial margins looks correct, as indeed is the exposed situation.

N.B. Apothecia of this species often show blackening, including a few in the photograph. Some have confused this with the algae of C. ceracea. I have photographs of definite fungal infection that will go up on my site one of these years - assuming it checks out as the fungus I assume it is!


Ginny B's picture

Thanks, Alan

Thanks Alan. I wonder if my grandson would loan me his microscope? I've never even looked down a microscope let alone owned one! It would be interesting.
The apothecia all seemed very hard and rock like. Is there a time of year that is better than others to attempt a cross-section when they might perhaps be softer?

AlanS's picture

Not really

Lichen apothecia are very long lived and time of year often doesn't make a lot of difference. They soften in damp weather and harden in dry weather. I usually put specimens in a damp chamber for a while (i.e. a plastic box with damp, plain kitchen paper) before sectioning (or taking studio photos).