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Annals of Botany 35: 201-211, 1971
© 1971 Annals of Botany Company

RESEARCH-ARTICLE

Zoospore Structure and Colony Formation in Pediastrum Spp. and Hydrodictyon reticulatum (L.) Langerheim

A. F. HAWKINS and G. F. LEEDALE

Department of Botany, University of Leeds

Received: 30 April 1970   

The process of daughter colony formation in Pediastrum biradiatum Meyen, P. tetras (Ehren-berg) Ralfs, P. duplex Meyen, and Hydrodictyon reticulatum (L.) Lagerheim has been investigated using light microscopy and electron microscopy of thin sections. The precise disposition of the organelles confers upon the zoospores of these algae a special symmetry of a type unusual for the Chlorophyta. Apart from this, the detailed ultrastructure of the zoospore and young vegetative cells resembles that of other green algae previously investigated. A common sequence of events has been found to occur during colony formation in both Pediastrum and Hydrodictyon, with a correlation between zoospore symmetry and that of the colony produced. The changes involved in the transition from a motile to a non-motile cell are considered, and appear to have features in common with this process in some other green algae. The early stages in wall deposition involve the simultaneous formation of two distinct layers and serve to stick together the cells which by this time have collectively assumed the basic morphological characteristics of the mature coenobia.


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