| Re: Another lichen?
This is poorly developed but elderly Datronia mollis, one of the bracket fungi and not a lichen. As well as being old, the surface has been colonised by green algae, so it is not looking very typical.
It usually forms more extensive and distinct brackets, but small, circular fruitbodies like this one are not unusual. The pores are "irpicoid" - very irregular and angled.
Many pictures show the more usual, extended brackets but there is a splendid (i.e. expensive!) new Italian monograph on polypores (Fungi Europaei vol. 10) with an excellent photograph of this same growth form.
Another fungus that can look very similar when old and grey, also forming small, circular colonies and with the same type of pores, is Schizopora paradoxa, very common on fallen wood. However it does not form brackets at all, and we do see the narrow upper bracket surface in Richard's photograph. (S. paradoxa is much lighter in colour when fresh.)
Alan |