Gliophorus psittacinus

Gliophorus psittacinus, commonly known as the parrot toadstool or parrot waxcap, is a colourful member of the genus "Gliophorus", found across Northern Europe. It was formerly known as "Hygrocybe psittacina", but a molecular phylogenetics study found it to belong in the genus "Gliophorus". It had already been placed in "Gliophorus", but it had been considered a synonym of "Hygrocybe".
Description.
The Parrot Toadstool is a small mushroom, with a convex to umbonate cap 1–3 centimetres (⅓–1 in) in diameter, which is green when young and later yellowish or even pinkish tinged. The 2–4 cm stipe is green to greenish yellow. The broad adnate gills are greenish with yellow edges and spore print white. The green colouring persists at the stem apex even in old specimens.
Its odour and taste are not distinctive. There are no known chemical tests.
It fruits late summer to autumn (September to November)
Distribution and habitat.
"Gliophorus psittacinus" is widely distributed in grasslands in western Europe, United Kingdom, Iceland, Greenland, the Americas, South Africa, Japan, being found in late summer and autumn. In Europe it is apparently in decline due to the degradation of habitats. Early Australian records of this form have been found to be the similar green toadstools "Gliophorus graminicolor" or "G. viridis" on reexamination. Gliophorus psittacinus is known to occur at one site in the Lane Cove River valley near Sydney.
Edibility.
Despite its small size and being coated in a sticky substance, "Gliophorus psittacinus" is often listed as edible in mushroom guides, inedible in others. Consumption of over 20 specimens in one sitting, however, can cause gastrointestinal disorders.