Pollen germination and fruit in P. dasycaulon . A. In vitro pollen germination. Arrows indicate the germinating pollen and pollen tube. B. A single pollen after acetolysis. Note the trizonocolpate nature of the pollen. C. Pollen germination on stigmatic surface observed under normal microscope after hydrolysing the pistil. D. Four mature fruits growing on a tree from study site. E. Longitudinal section of a single fruit showing 6 red seeds inside. F. A dehisced fruit with a single seed.