Ginny B's picture

P1030776_lichen on beech root

Observed: 13th August 2012 By: Ginny B
S159 Neighbourhood Nature - course complete
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P1030776_lichen on beech root
P1030778_lichen on beech root

Growing on the root of an old beech tree and testing C- and K-. I imagine that the grey 'tassels' are where the lichen is growing on the moss? Could this be one of the Lecanora rupicola?
Having re-checked this one I can describe the apothecia as being almost in rows and they appear to have tiny, sunken, dark spots in the centre.


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Species interactions

No interactions present.


AlanS's picture

Not L. rupicola

It looks like am immature Pertusaria to me. I would have suggested P. hymenea, but that is C+ yellow, though C reactions are easy to miss.

Lecanora rupicola, as the Latin name suggests, occurs on rocks and stonework, not trees.


Ginny B's picture

Thank you Alan.

Thank you Alan. I'm afraid Latin is not a language I've ever studied and I hadn't realised there was any reference to rocks.

I did look at the Pertusaria family but didn't find anything that looked that similar and the photos of L rupicola seemed to me to be the nearest. The regularity of the rows of apothecia are very striking, but there are other smaller patches on the trunk where they are not so regular.

I will go back and test again and see if I can get a C+ reaction (I gather from what you say that the colour can swiftly disappear) and report back.

Ginny B's picture

Tested it again

I went back and re-tested it. It is still C-. I did notice that the remarkable regimented lines of apothecia are growing over slight ridges on the beech bark.

There are other beeches nearby along the wood perimeter and they too have this same lichen growing on them but not in nearly as big patches. Beeches elsewhere in the wood don't appear to have any.