As with many other species of Inocybe, I. lacera contains the poisonous chemical muscarine which, if consumed, can lead to salivation, lacrimation, urination, defecation, gastrointestinal problems and vomiting.

Found in Europe and North America, it typically grows in autumn in mixed woods, favouring sandy soil.

[3] It is commonly known as the Torn Fibrecap,[4] while in German it is known as Gemeiner Wirrkopf and in French as Inocybe déchiré.

[4] The stipe, or stem, is 2 to 3 centimetres (0.8 to 1.2 in) tall, and 3 to 6 millimetres (0.12 to 0.24 in) thick, brown at the slightly bulbous base, but lighter towards the apex, and, again, fibrillose.

[1] I. lacera is one of a small group of related species with particularly long, cylindrical spores, the others of which can typically be found on sand dunes.

subsquarrosa, has small spores and thin-walled cystidia, while a North American variant, I. lacera var.

[2] However, species of Inocybe should always be avoided when choosing mushrooms for consumption, as many of the members of the genus are dangerously toxic.

Consumption of the mushroom typically leads to salivation, lacrimation, urination, defecation, gastrointestinal problems and emesis (vomiting), which has given rise to the acronym SLUDGE.

[7] Other potential effects include a drop in blood pressure, sweating and death due respiratory failure.