Pollen and spores : form and function : papers presented at an international symposium organized by the Linnean Society of London and the Systematics Association, held at the Linnean Society's Rooms and the British Museum (Natural History), London, 27-29 March 1985 - Blackmore, Stephen; Ferguson, I. K. (Ian Keith), 1938-; Linnean Society of London; Systematics Association (Linnean Society symposium series,, 1986)