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Added: 21st October 2011 Description:
Thought I would do the Opal Air survey, but even after reading and looking at all the pictures on the website I am not sure what I'm looking at! Help please!
On a low stone wall, facing south, in partial shade.
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: Difficult to make out detail, but what you seem to have here is one of the powdery (leprose) species that form very irregular and ill-defined patches on trunks, rocks and walls. Individual species of Lepraria require close examination and often chemical testing, so I am not going to guess at more than the genus. The Opal Air Survey, assuming it's the same as when I last looked at it, asks folk to look for just nine relatively easily recognised lichen species on trees, so the complexity of lichens in general is not so much of an issue.
No interactions present.
Other observations of