The World Pollen and Spore Flora was an irregularly published serial describing the pollen and spores in different families of spermatophytes, pteridophytes and fungi. Large plant families may be divided into suitable smaller taxonomic units. The World Pollen and Spore Flora was published by Scandinavian University Press, Oslo/Stockholm (1973-1994) and by Taylor & Francis, Oxford (1994-2004). Previously, it was part of the subscription to GRANA, from 1993 as a separate serial. It was discontinued in 2004.