On 15 Sep 2011 13:07:42 GMT, wrote:

Sorry, no photo. However, just found one, and it looks familiar, but I
can't place it.

Parasol shaped, white turning to brown, gills are white (which iirc, is a
bad sign if looking for edible), straight stem, no volval bag (good sign for
not being poisonous), gills not attached to stem. Found on soil, autumn.

You don't say on soil WHERE.
You don't say how BIG.
Look up parasol mushroom on Google images.
It sounds a bit like it, but there are so many similar things.
Parasol is a delicacy and one I would eat.

Pam in Bristol