Form and Pattern in Pediastrum

  • W. F. Millington
Part of the Cell Biology Monographs book series (CELLBIOL, volume 8)


The members of the Hydrodictyaceae, which includes such genera as Hydrodictyon (the water net), Sorastrum, and Pediastrum, and also the Scenedesmaceae are of morphogenetic interest because the colony is assembled in a specific form from individual cells. The colony is a coenobium; the number of cells of the colony is determined at the time of mitosis and cytokinesis in the parental cell, and is fixed at 2n (4, 8, 16, 32, 64, etc.). No further cell division occurs until a new daughter colony is generated; growth of the colony is entirely by cell enlargement. Colony formation is asexual; the colony is assembled from spores. Sexual reproduction leads to the production of spores, which form the new colony. While genera of the Scenedesmaceae form colonies from non-motile autospores (Scenedesmus, Coelastrum), in the Hydrodictyaceae, swarming zoospores aggregate to form the colony (Hydrodictyon, Pediastrum, Sorastrum). The form of the colony is thus directed by the manner in which the spores assemble and the shapes the cells assume.


Colony Formation Golgi Apparatus Cell Shape Nuclear Envelope Wall Layer 
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Copyright information

© Springer-Verlag/Wien 1981

Authors and Affiliations

  • W. F. Millington
    • 1
  1. 1.Department of BiologyMarquette UniversityMilwaukeeUSA

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