The spores are about 4 x 2.5um (the field of view is about 86um wide). This agrees with the 4.5–5.5 x 2.5–3um given here.
And the hyphae have clamp connections:
First photo and specimen taken in Whiteknights Park, Reading, UK, on 2013-12-07.
Small grey bonnet mushrooms, probably Mycena cinerella., growing in a pile of decaying branches and twigs.
Photos taken in Wilderness, Whiteknights Park, Reading, UK, on 2012-10-18.