October 2002 Buckinghamshire. Photograph copyright Leif Goodwin.
Convex, expanding, smooth, brown decorated with dark brown pyramidal warts, cracking to reveal the pale flesh below, margin overhanging, to about 18 cm across
Free, broad, crowded, white to cream
Cylindrical, whitish at the apex, fibrillose and brown below, sometimes hollow, ring apical, woolly, remnants visible on the stem in older specimens
Unpleasant, like Lepiota cristata
Summer to autumn
On soil, and well rotted wood, in deciduous woods
Spores ellipsoidal, smooth, dextrinoid (6-10) x (2.5-3.5) µm2. Gill edge cystidia club shaped. Pileipellis formed from chains of ellipsoidal cells, some septa clamped.
The Echinoderma genus contains many similar looking species, the identification of which requires microscopy