I am a retired Tree man. There is a very good site for us as Arbtalk co.uk which has a fungus ident thread and an App available for tree fungi.
Completely stumped on this little chap, Found this on a cut section of fallen oak that is resting in a reed bed so this must have some brackish water tolerance?
The overall size is approximately 2.5-3cm across and with the bell shaped body I cannot find anything similar in my books.
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Looks like it, I would love to find some just to do the spore print as it's apparently a lavender/lilac coloured spores.