We had previously seen a number of dull brown Lichens on the Sea Wall beside the Thames close to Blackfriars Bridge. And assumed they were dried up Lichens (see below).
But they aren't. They are Xanthoparmelia pulla Lichens and that is their natural appearance.
They were identified by John Skinner, the Lichen Recorder for the London Natural History Society. He says, 'I can find no other records of this from London for ever. In fact, if you look at the distribution map for it on the BLS website you will see how rare it is in south east England'.
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