Masked mushroom; Agaricus personatus 1; variable mushroom; Russula heterophylla 2; and amethyst clavaria; Clavaria amethystina 3. Chromolithograph of an illustration by Mordecai Cubitt Cooke from 鈥楢 Plain and Easy Account of British Fungi;' Robert Hardwicke; London 1862. Cooke (1825-1914) was an English botanist and mycologist who worked at the India Museum and the Royal Botanic Garden at Kew.