Deer Shield Fungus - Pluteus cervinus

The cap is brown with darker radial lines, bell shaped when young and more convex later with a blunt umbo. The stipe is quite long and is usually thicker at the base. It is covered with brown vertical fibrils on a white ground. The gills are white, becoming pale pinkish-brown.

The cystidia on the gill edges stick out further than the basidia and have short projections at the tip, like horns. These can be seen at x400 magnification - put a small piece of gill on a slide with a drop of water, and squash under a cover-slip.

other Pluteus e.g. P pouzarianus on conifer wood

habitat/substrate

Photograph top down, in side view and underneath to show gills and full length of stipe.  You must note the habitat and substrate on which it was growing

Found on broadleaved wood, stumps etc; also woodchip, rarely conifer. 

Early summer to late autumn.

Widespread and very common (Kibby V2, 2020)

Fairly frequent in Leicestershire and Rutland.

https://www.first-nature.com/fungi/pluteus-cervinus.php