Stropharia aeruginosa.

''Stropharia aeruginosa'', commonly known as the verdigris agaric, is a medium-sized green, slimy woodland mushroom, found on lawns, mulch and woodland from spring to autumn. The edibility of this mushroom is controversial - some sources claim that it's edible, while others claim it to be poisonous, although effects are little known and its toxic constituents undescribed.