A bonnet toadstool (Mycena sp.)

This tiny, 2 mm, toadstool has appeared in a cushion of moss growing by the north west side of the sallow log. This is the first stalked fungus to have appeared since the project started.

It looks like Mycena pseudocorticola, but there are so many similar species that I would not go firm on this without a second opinion. Tiny though it is, it seems quite frost resistant and was unaffected by last night's subzero temperatures.