Tar-spot Fungus on Sycamore

We went to Anglesey Abbey, Lode, Cambridgeshire this morning where there was a pleasant guided tour of the Winter Walk with plenty of garden plants worth photographing. Inspired by "Lathyrus Odoratus" I thought I had better look for some fungi and before long came across a nice group of Glistening Inkcaps. Not wishing to burden you with too many of the same I checked and found that we already have
30/08/2011 http://www.blipfoto.com/entry/1373227
16/09/2011 http://www.blipfoto.com/entry/1408290 (by said Lathyrus)
19/11/2011 http://www.blipfoto.com/entry/1540403

It is the season of rusts, smuts, mildews and moulds so I am going with the Tar-spot Fungus on the leaf of Sycamore.