The conical bald head ( Psilocybe semilanceata ) is the most widespread and most common psilocybin-containing agaric fungus in temperate zones of the earth.
In terms of color and size, it is an inconspicuous lamellar fungus with a hat the size of a fingernail and a thin, not quite straight stem. It grows on rather poor grasslands, often on autumn sheep or cattle pastures, but never directly from the animal manure. Its mycelium lives as a grass dweller. The dark lamellae of its fruiting bodies run almost parallel to the outside of the hat towards its tip – in stark contrast to the conical manure ( Panaeolus acuminatus ), which is often confused with it, or the hemispherical manure ( Stropharia semiglobata ), which is often found in similar but more dung-rich localities ), all of which are also dark spurs.
The name-giving feature of the mushroom, the pointed, conical, bald hat, has a diameter of 0.5 to 1.5 centimeters and usually has a small bulge, a “nipple”, on the tip, which is initially almost glassy in damp weather. When wet, its color is dark brown, its epidermis then sticky and easy to peel off. In dry weather the hat is light ocher in color. The hat usually forms an angle of 55 degrees, but spreads a little with age. The brim of the hat is usually pulled together like a circle and is darker. The lamellae are initially clay-brown and change color to dark brown to purple with increasing age of the fungus; in the cold in late autumn, however, they remain light because the dark spores then fail to develop. The lamellar edges are light.
The stalk has a diameter of one to two millimeters and is four on short-grass grassland, in higher up to 13 centimeters long. It is whitish to ocher in color, elastic, so not easy to break. The base of the stalk is often bluish in color. The blue stain also occurs within about an hour from pressure on the lower part of the stem. The “hat meat” (the trama) is thin and can be torn without effort. The spores are elliptical, thick-walled and smooth and have a size of about 12-16 µm × 6-8 µm. The spore dust is dark brown to purple brown. The taste is not sharp, but like the barely noticeable smell, radish to grassy.