This species has a cap of 5-10cm diameter, which is covered in brown fibrous scales. The stem has a ring. The white flesh bruises red when cut if it is fresh and brown if older.   Spore print is chocolate brown 

There are many similar species

Photograph from top down and in side view; photograph fresh specimen, and photograph cut or bruised section.

It is found in mixed woodland

From late summer through autumn.

Fairly common and widespread in Britain.

Fairly common in Leicestershire and Rutland.

https://www.first-nature.com/fungi/agaricus-sylvaticus.php