Short rods, 0.6 to 0.8 by 0.8 to 1.0 micron, relatively uniform in shape and size. Motility uncertain. Non-differentially stained with fuchsin. Non-acid-fast. Gram-negative. Gelatin: No liquefaction. Agar colonies: Circular, slightly larger than those of Myxococcus pelomyxae, smooth, en- tire, shiny, moderately raised, butter-like consistency, colorless to yellowish, transparent. Broth: Slight clouding, grayish white ring at surface, slight sediment, no odor. Litmus milk: Unchanged. Indole not produced. Hj'drogen sulfide not produced. Acid from glucose, lactose, sucrose, xylose, salicin and mannitol. No acid from glycerol, inulin or dextrin. Starch not hydrolyzed. Nitrites produced from nitrates. Source: Found in the cytoplasm of the rhizopod Pelomyxa palnstris Greeff. F. Cladothrix pelomyxae Veley, 1905. (Veley, Jour. Linn. Soc, Zool., 39, 1905, 375; also see Leiner, Arch. f. Protistenk., 47, 1924, 282; Kirby, in Calkins and Summers, Protozoa in Biological Research, New York, 1941, 1025; and Hollande, Bull. Biol. France Belg., 79, 1945, 49.) pe.lo.my'xae. M.L. fem.n. Pelomyxa a genus of rhizopods; M.L. gen. noun pelomyxae of Pelomyxa. Rods, 1.5 to 22.0 microns or more in length, divided into several to many sections by transverse partitions. Generally aggregated in proximity to the nuclei, which may be thickly invested by close-set organisms applied to the surface. Source: Found in the cytoplasm of the rhizopod Pelomyxa palustris Greeff and probably also in other species of Pelomyxa. G. Myxococcus pelomyxae Keller, 1949. (Ztschr. f. Naturforsch., 4b, 1949, 296.) pe.lo.my'xae. M.L. fem.n. Pelomyxa a genus of rhizopods; M.L. gen. noun pelomyxae of Pelomyxa. Short, ellipsoidal rods, about 1 by 2 microns, very uniform in shape and size. One end stains deeply with fuchsin, organisms thus stained appearing pyriform. Highly motile in young cultures, but no fiagella are demonstrable by staining. Non-sporeforming. Non-acid- fast. Gram-negative. Gelatin: No liquefaction. Agar colonies: Circular, about 2 mm in diameter, smooth, entire, shiny, moderatelj' raised, of very soft nearly mucoid consistency, colorless. Broth: Slight clouding, white ring at surface, no sediment, no odor. Litmus milk: Unchanged. Indole not produced. Hydrogen sulfide not produced. Acid from glucose, xylose, mannitol and dulcitol. No acid from lactose, sucrose, glycerol, salicin, inulin or dextrin. Starch not hydrolyzed. Nitrites produced in slight amounts from nitrates. No nitrogen fixation. Suggestion of ability to digest cellulose. Comment: According to Keller the large rods described by Veley et al. from the rhizopod Pelomyxa palustris represent fruiting bodies of Myxococcus pelomyxae. If this view were to be accepted, M. pelomyxae Keller would be identical with Cladothrix pelomyxae Veley. Source: Found in the cytoplasm of the rhizopod Pelomyxa palustris Greeflf.
