Leucocoprinus brebissonii

Leucocoprinus brebissonii is a species of fungus in the family Agaricaceae. It was first described by Louis-Luc Godey in 1874 as "Lepiota brebissonii", and moved to "Leucocoprinus" by Marcel Locquin in 1943. It is commonly called the skullcap dapperling due to its distinctive pattern on the cap. Until recently, this mushroom was only found in Europe but over the last few years has been identified in the Pacific Northwest.
Description.
"Leucocoprinus brebissonii" is a small, delicate, mushroom with white and brittle flesh. Its cap () starts out conical expanding to a plane in age, with a dark brown/gray center that breaks up and radiates outwards on a white and deeply striated background. The white stem of "L. brebissonii" is long and slender ( by ), equal or slightly clavate. It usually has a ring present, but due to its fragile nature sometimes it is rubbed or washed off. Its gills are crowded, white and narrowly attached to the stem, but occasionally detach in age. The spores (9 to 12 µm x 5.5 to 7 µm) are white and have a pronounced germ pore, elliptical or almond shape.
Distribution and habitat.
"Leucocoprinus brebissonii" is found in Europe and North America from summer to fall, where it grows in the soil in woods with deciduous trees.
Edibility.
"Leucocoprinus brebissonii" is suspected to be poisonous. Its taste and smell are nondescript.