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Ultrastructural studies revealed that Chlorosarcina stigmatica Deason differs from C. brevispinosa and C. longispinosa Chantanachat and Bold because the vegetative cells possess a pyrenoid, and the zoospores have chlorophycean characteristics. Zoospores of the latter species exhibit pleurastrophycean characteristics including counterclockwise absolute orientation of the flagellar apparatus components. Nuclear division in C. longispinosa, like that of Friedmannia israelensis Chantanachat and Bold, is metacentric. It is suggested that a new genus, Desmotetra, be erected for Chlorosarcina stigmatica, and that it, along with Chlorosarcinopsis Herndon, be placed in the Chlorococcales, Chlorophyceae. Chlorosarcina brevispinosa and C. longispinosa belong in the Pleurastrales, Pleurastrophyceae.

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Deason, Temd R. (U. Texas, Austin.) Three Chlorophyceae from Alabama soil. Amer. Jour. Bot. 46(8): 572–578. Illus. 1959.— Three new algae from Alabama soil are described as follows: Spongiococcum gen. nov., with 2 species, S. tetrasporum sp. nov. and S. alabamense sp. nov. The distinguishing attributes of the genus Spongiococcum are: (1) possession of a sponge‐like plastid; (2) presence of pyrenoids; and (3) Chlamydomonas‐type zoospores. The description of the genus Chlorosarcina Gerneck is emended with respect to zoospore type, and Chlorosarcina stigmatica sp. nov. is described. Cultures of these organisms have been deposited in the Culture Collection of Algae, Department of Botany, Indiana University, Bloomington, Indiana, and herbarium specimens have been sent to the Chicago Natural History Museum, Chicago, Illinois.