John R. Rowley

• A study of recent pollen at Lake Itasca Biological Station
• Influence of pinocytosis and membrane specializations on pollen wall form
• Modifications in design and use of the Livingstone Piston Sampler
• Nonhomogeneous sporopollenin in microspores of Poa annua L.
• The aperture of the pollen grain in Commelinantia (1)
• The fine structure of the pollen wall in the Commelinaceae
• Vertical migration of spherical and aspherical pollen in a sphagnum bog