In 1958 E. BUNNING published a book in the former series "Proto- plasmatologia" entitled "Polaritat und inaquale Teilung des pflanzlichen Protoplasten" (polarity and unequal division of the plant protoplast) in which for the first time results of experimental plant cytomorphogenesis were re- viewed. This book was based completely on light microscopic observations and rather simple experimental techniques. Since then our knowledge of basic cytomorphogenetic mechanisms has greatly increased, especially with the introduction of modern ultrastructural, biochemical and sophisticated experi- mental...