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A B S T RAe T Three new species of Protostelium (Order Protostelida of the Mycetozoa) are described: P. irregularis, P. zonatum, and P. pyriformis, all with rather wide distribution and occurring on dead attached plant parts, less often in soil and humus. The latter two species differ from the first and from the other two known species, P. mycophaga Olive and Stoianovitch and P. arachisporum Olive, in the endogenous origin of the stalk. P. mycophaga var. crassipes, with vesicular stalk bases, is the third variety of that species to be described. A key to the genus is included.

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SYNOPSIS. Mieroglomns paxillns is described as a new genus and species of the subclass Protosteliida (Class Eumycetozoa). It has been isolated only once from casuarina bark collected in Oahu, Hawaii. The new organism is characterized by a uninucleate ameboid trophic stage that feeds on bacteria and by sporocarps with spike-like stalks terminated by microsporangia containing tetrads of ameboid protoplasts or thin-walled spores. No flagellate cells are produced. The tetrads are typically formed by successive bipartition following conjugate nuclear divisions in the sporogen. The cells of the tetrad are at first binucleate but soon become uninucleate as a result of nuclear degeneration. Variations in the process of sporogenesis are described. -We are grateful to Dr. Maxwell Doty, Department of Botany, m~~i o~~y~ -67, 1975. 1087-100. The protostelid genus Schizoplas-> 1976. The ballistosporic protostelid genus University of Hawaii, for the field trip on which the new organism was collected. 5, Schizoplasmodium. Am. J . Bot. 63, 1385-9.