Elm sidefoot, Agaricus ulmarius 1, furrowed clavaria 2, and cylindric clavaria 3. . Elm sidefoot, Agaricus ulmarius 1, furrowed clavaria, Clavaria rugosa 2, and cylindric clavaria, Clavaria vermiculata 3. 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.