Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Thanks for the ID, am sure you have ID't this species for me a few times and should remember by now.
I was at my parents in London the other week. As a child I read a book in the library that got me interested in lichens but there were virtually none around back in those days so lost interest and forgot the species as rarely found anything interesting. But now at parents house there are lots, such a big change over the years with clean air act. Even here in milton keynes the amount of lichens on the trees seems to be increasing although some of the usnias I saw perhaps 15 years ago seem to have vanished. Perhaps the huge increase in traffic here has had detrimental effects on certain species.
There was a survey of London's lichens in the 1960s that found just 9 lichens growing on trees in the city. I don't know the numbers now, but the situation is greatly improved.
As I understand it, it's generally the case that crustose species tolerate pollution the best, followed by foliose lichens, which have a larger surface area. The fruticose usneas, which in terms of surface area are even more exposed to the atmosphere, fare least well.
Lat/Lng: 52.028184, -0.71045583333333
OS grid ref: SP885374