Macrocybe gigantea

Macrocybe gigantea is a species of mushroom that is native to India (West Bengal), Pakistan, and Nepal.
English botanist George Edward Massee described this species as "Tricholoma giganteum" in 1912 from material collected in Shyamnagar, West Bengal by Ethel Maud Burkill in 1911. "Tricholoma" was a wastebasket taxon; the species was moved into the new genus "Macrocybe" in 1998. Specimens currently classified as "M. gigantea" from Pakistan and China were more closely related to each other than specimens from India.
The mushroom has a smooth cap that is conical when young before expanding flattening out and can reach 30-35 cm in diameter. It is variable in colour, initially white before ageing to light grey, paler at the margin. The crowded sinuate gills are yellow. The cylindrical stipe is 15-18 cm high by 6 cm wide and is the same colour as the cap. The firm white flesh is up to 3 cm thick under the cap. The spore print is white. The oval spores measure 5.7–7.5 μm long by 4.0–5.3 μm wide 
In West Bengal, "M. gigantea" grows in groups or sometimes fairy rings in shady or grassy areas, or in association with angiosperm trees. "M. gigantea" has been found growing on elephant dung in Kerala state in India.
Known locally as "Boro dhoodh chhatu", roughly translated as "smells like milk when dried", "M. gigantea" is picked and sold at roadside markets in central and coastal West Bengal and cooked in mustard oil and spices. In Tripura, the local Tripuri people also collect and eat this mushroom. "M. gigantea" is able to be cultivated, with investigations showing that pearl millet ("Cenchrus americanus") is a promising substrate.