Blistered Cup Peziza vesiculosa Bull. (illustrated 40% life size) Cup 3–8cm across, often in clusters, cup-shaped, margin often strongly inrolled, sessile; inner surface pale yellowish-buff, often wrinkled, outer light buff, very scurfy. Flesh light buff; brittle. Spores 20–24×11–14¼, elliptical, smooth. Asci 380×25¼, blued at the tip by iodine. Habitat on manure, rotting straw, and rich soil; all year. Frequent. Poisonous unless well cooked.