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Black-brown lichen on limestone

Observed: 22nd November 2012 By: pf339
S159 Neighbourhood Nature - course complete
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Black-brown lichen on limestone i
Black-brown lichen on limestone ii
Description:

Dark black-brown thallus growing on limestone gravestone. Thallus looks swollen and is covered with globular isidia and isidiate lecanorine apothecia. Possibly Collema auriforme.

Identifications

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.

Comments

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Collema tenax

Thanks for help with this identification and the information points about Collema auriforme.
Phil