Entoloma Lucidum
Taken at Hogganfield Loch on 9th September 2018 using  Panasonic Lumix LX5 in macro mode.
Fact File

Entoloma Lucidum.
Species :
Order:
Family:
Entoloma_Lucidum.
Agaricales.
Entolomataceae.
Habitat:
Cap:
Stem:
Season
:
Edibility:

Grassland and in grassy clearings in deciduous woodland.
1 - 5 cms diameter.
4 - 8 cms.
Summer - Autumn.
This is a rare find although it is quite widely distributed. It is unclear whether this is a toxic toadstool, but as some Entoloma species - for example Entoloma sinuatum are known to be deadly poisonous it seems sensible to treat Entoloma lucidum as suspect and not to be collected for eating. 

When picking any fungus for consumption, caution should be exercised at all times.