image
Figure 3–1. Division of cells in filamentous algae of Conferva genus (After von Mohl, 1835; From Katznelson, 1963).
image
Figure 3–2. Division of cells during pollen grain formation (After Nägeli, 1842; From Katznelson, 1963). First pictures of dividing cells with constriction of protoplasm and forming barrier walls between the daughter cells.