
%0 Journal Article
%A Marchant, HJ 
%A Pickett-Heaps, JD 
%T Ultrastructure and Differentiation of Hlydrodictyon Reticulatum VI. Formation of the Germ Net
%J Australian Journal of Biological Sciences
%D 1972/12/01
%V 25
%N 6
%P 1199-1214
%K 
%R https://doi.org/10.1071/BI9721199
%U https://www.publish.csiro.au/paper/BI9721199 
%X Uninucleate, biflagellate, net-forming zoo ids arise by cleavage of the multi-nucleate cytoplasm of polyhedra. These zoo ids appeared to be indistinguishable from net-forming zooids produced by cylindrical coenocytes. Whereas zoo ids derived from cylindrical cells aggregated within their parental cell wall to form cylindrical nets, zooids produced by polyhedra swarmed within a spheroidal vesicle, probably derived from the inner layer of polyhedral wall, and aggregated usually as a flat net, similar to nets of other species of Hydrodictyon and vegetative colonies of Pediastrum. Bands of peripheral microtubules underlaid the initial sites of contact of aggregating zooids; the role of these microtubules, which were generally oriented in the plane of the developing net, and other aspects of patterned cellular aggregation are discussed. 
