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Contents: Blackmore, S.: Sporoderm homologies and morphogenesis ofEchinops sphaerocephala (Compositae)/ Rowley, J.R.: The fundamentalstructure of the pollen exine/ Owens, S.J., Sheldon, J.M., Dickinson,H.G.: The microtubular cytoskeleton during pollen development/ Bolick,Margaret R.: The pollen surface in wind-pollination with emphasis on theCompositae/ Pacini, E.: Harmomegathic characters of Pteridophyta sporesand Spermatophyta pollen/ Tryon, Alice F.: Fern spores: evolutionarylevels and ecological differentiation/ Guinet, P.: The genus Acacia(Leguminosae, Mimosoideae): its affinities as borne out by its pollencharacters/ Nilsson, S.: Taxonomic and evolutionary significance ofpollen morphology in the Apocynaceae/ Nowicke, Joan W. Miller, J.S.:Pollen morphology of the Cordioideae (Boraginaceae): Auxemma, Cordia,and Patagonula/ Subject index.