What You Should Know
Leucocoprinus brebissonii typically are thin-fleshed with a radially pleated cap and tendency to look collapsed with age, as if partially deliquescent. The center of its cap is very dark gray brown to almost black and the margin is white but decorated with small gray-brown to blackish scales. The gills are crowded and white and the stipe is slender and clavate, white with pinkish brown in the lower part, and bearing a white somewhat fragile ring that often is lost with age.
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.
Leucocoprinus brebissonii is suspected to be poisonous. Its taste and smell are nondescript.
Other names: Skullcap Dapperling.
Leucocoprinus brebissonii Mushroom Identification
2 to 3 cm (3⁄4 to 1+1⁄8 in) 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 (4.5 to 6 cm (1+3⁄4 to 2+3⁄8 in) by 3 to 6 mm (1⁄8 to 1⁄4 in)), 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.
Leucocoprinus cepistipes is similar in stature, but the cap disc is cream to buff-brown and fruitbodies usually grow in small, subcespitose clusters.
Photo 1 - Author: alan_rockefeller (Alan Rockefeller) (Creative Commons Attribution 4.0 International)
Photo 2 - Author: Debbie Klein (dejaklein) (Creative Commons Attribution-Share Alike 3.0 Unported)
Photo 3 - Author: Debbie Klein (dejaklein) (Creative Commons Attribution-Share Alike 3.0 Unported)
Photo 4 - Author: Peter Santerre (Creative Commons Attribution-Share Alike 3.0 Unported)
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