Emetic mushroom, Russula emetica 1, and orange cups, Peziza aurantia 2. . Emetic mushroom, Russula emetica 1, and orange cups, Peziza aurantia 2. Chromolithograph of an illustration by Mordecai Cubitt Cooke from A 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.