Leptonia incana
The green colour and the pinkish spore print make this species distinctive. Hygrocybe psittacina is also green but is very slimy and has a white spore print. Leptonia incana is very variable. Sometimes the cap is uniform and other times radially streaked. The pea-green colour (click here) can fade to yellow-green or yellow as seen here.
Caps are 2-3 cm, dry, smooth, convex to flat, umbilicate, pea-green to turquoise-green becoming bright yellow and often radially striate at maturity. Mushrooms have the odour of mice. Gills are attached, well-spaced, greenish to yellowish and becomine pale orange-brown. Stalks are smooth, shining and green to yellow-green. The spore print is pink. Readily recognized by its green to yellow-green colour and unpleasant taste, this mushrooms is common and widespread and fruits on the ground in mixed woods.