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Added: 9th October 2012 Description:
Flattened yellow crustose lichen that cannot be easily disloged from vertical raised brickwork bed surrounding driveway. Some smaller populations - this was the largest. Observed in association with considerably smaller blue grey crustose? lichens.
Identifications Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
Confidence: It's likely to be this, but I can't be certain. Notes: Such a vast array of yellow crustose lichens so I am not confident in identifying this particular lichen any further. I understand crustose lichens may be more common on mortar between bricks rather than the bricks themselves? This population doesn't appear to distinguish between the two but appears more prevalent on the bricks themselves.
Sincerely hope it isn't algae but given the dry and sunny location am fairly confident it is a lichen!
Confidence: It's likely to be this, but I can't be certain. Notes: This looks like a lichen that until recently we called Caloplaca citrina, but which is now regarded as another European species not yet mentioned outside specialist literature. However, as we cannot see a detailed close-up, it's best I don't throw alternative names around. Ideally it would be given a chemical test to confirm it is indeed a Caloplaca, but in this case I think it is. "Caloplaca citrina" would do as a probable label, but the name has been used in Britain to cover several species, and quite possibly none is true C. citrina.
No interactions present.
Other observations of