SUMMARY: A new marine species of is described for which the name is proposed because of its diminutive proportions. This species has been isolated repeatedly from and other algae collected from the Atlantic Ocean in the region of Woods Hole, Massachusetts. The vegetative stage, as in other species of , consists of independent cells interconnected by threads of slime which form a net-like structure called the net-plasmodium. differs from all previously described species of this genus in the size, shape, and movement of its cells, in its method of cell division, its colonial morphology and by the formation in aged cultures of multinucleate bodies which resemble miniature plasmodia. No fructification has yet been observed. This species has been grown in pure reproducible laboratory culture on a serum + sea water medium for a period of five years.


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