A COMPARATIVE STUDY OF CELL DIVISION INTRICHOSARCINA POLYMORPHAANDPSEUDENDOCLONIUM BASILIENSE(CHLOROPHYCEAE)1

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Abstract
SUMMARY: Pseudendoclonium basilienseandTrichosarcina polymorphaare essentially identical with regard to the fine structural details of cell division even though one was previously classified in the Chaetophorales and the other in the Ulvales. Cell division in the 2 genera is also shown to be like that inUlva,as previously suggested might be the case. The combination of mitotic and cytokinetic characteristics common to the 3 genera is distinctive: (1) precocious development of a thick cleavage furrow, (2) centrioles distinctly lateral to polar fenestrae, (3) collapse of the interzonal spindle at telophase, and. (4) a cleavage furrow not associated with microtubules. It is suggested that features of vegetative cell division presently provide the best, characteristics for defining the Ulvaceae and that the use of growth habit should be abandoned. Despite the fact that a phycoplast is not present, in these algae, it is concluded that their affinities lie with genera that do possess a phycoplast.