25 August 2008 West Sussex. Photograph copyright Leif Goodwin.
Pestle or pear shaped, surface warty, white, warts falling away with age to leave a smooth surface, darkening with age, insides ripening into a powdery spore mass which is released through an apical opening in the thin outer skin, to about 5 cm high
White when young
On exposed and buried rotten wood
Spores spherical, smooth (3-4) µm
Edible when white throughout
Pyriforme means 'pear shaped'