Vinegar Cup Helvella acetabulum (L.) Quél. syn. Paxina acetabula (L.) Kuntze (illustrated 40% life size) Cup 4–6cm across, deeply cup-shaped; inner surface dark chestnut-brown, outer paler, finely downy. Stem 10–40×20–30mm; whitish; deeply furrowed, strongly ribbed along underside, more or less hollow. Spores 18–22×12–14¼, broadly elliptical. Asci 400×20¼. Habitat amongst leaf litter in woods, usually on calcareous soil; spring to summer. Occasional. Poisonous unless well cooked.
