Page:Bergey's manual of determinative bacteriology.djvu/912

 angiden, Geb. Borntraeger, Leipzig, 1924, 89.) dis.ci.for'mis. Gr. noun discus a disc; L. noun forma form; M.L. adj. disciformis disc-shaped. Vegetative cells: Rods 0.5 to 0.6 by 2.0 to 3.0 microns. Fruiting bodies: Cj^sts disc-shaped, crowded, sessile, attached by a more or less ragged, scar-like insertion or in masses. Cysts yellowish when young, when old dark orange -yellow, about 10 by 35 microns. Cyst wall distinct, thin, becoming very slightly wrinkled. Microcysts irregularly spherical, embedded in viscous slime, difficult to see in the ripe cyst. Source: Isolated from the dung of musk- rat and deer from Massachusetts and New Hampshire. Habitat: Found on decaying organic mat- ter in soil and in the dung of various ani- mals. Rare in Polish soils according to Krze- mieniewski (Acta Soc. Bot. Poloniae, 6, 1927). Illustrations: Thaxter (op. cit., 1904, PI. 27, Figs. 19-21) and Krzemieniewski (op. cit., 4, 1926, PI. II, Figs. 21 and 22). 2. Angiococcus cellulosum Mishustin, 1938. (Microbiologia, 7, 1938, 427.) cel.lu.lo'sum. M.L. noun cellulosum cellu- lose. Vegetative cells: 0.4 to 0.5 by 1.5 to 2.0 microns. Fruiting body: Regularly rounded (less frequently extended or angular), 20 to 150 microns in diameter; yellow or pink in color to drabbish when old. Encysted cells sur- rounded by a colorless cyst wall or envelope. Usually 1 to 3 short stalks, or cystophores, up to 10 microns high. Within the outer wall are numerous cysts containing microcysts. Cysts have regularly rounded form; unpig- mented to yellow; 5 to 15 microns in diame- ter, average 6 microns. Number of cysts in fruiting body increases with age. Size of microcysts not given. Vegetative colony: Fairly rapid growth on cellulo.se with silica gel. Colony has a yellowish cast. Reaches diameter of 1.5 to 2.0 cm after 6 days with center yellowish pink and margin tinged light pink. Surface moist. Fruiting bodies more numerous at center but distributed over entire area. Fruiting bodies do not noticeably protrude above the surface of the colony. Physiology: Cellulose attacked but not completely destroyed. Source: Isolated from soil. Habitat : Found on decaying organic mat- ter in soil. Genus IV. Sporocytophaga Stanier, 1940. (Jour. Bact., 40, 1940, 629.) Spo.ro. cy.to'pha.ga. Gr. noun spora seed; M.L. noun spora a spore; Gr. noun cyfus hollow place, vessel, cell; Gr. v. phagein to devour; M.L. fem.n. Cytophaga generic name; M.L. iem.n. Sporocytophaga the sporing Cytophaga. Spherical or ellipsoidal microcysts formed loosely in masses of slime among the vegeta- tive cells. Fruiting bodies absent. The type species is Sporocytophaga myxococcoides (Krzemieniewska) Stanier. Key to the species of genus Sporocytophaga. I. Microcysts spherical. A. Does not utilize starch. 1. Sporocytophaga myxococcoides. B. Utilizes starch. 2. Sporocytophaga congregata. II. Microcysts ellipsoidal. 3. Sporocytophaga ellipsospora. 1. Sporocytophaga myxococcoides (Krzemieniewska, 1933) Stanier, 1940. (Cy- tophaga myxococcoides Krzemieniewska, Arch. f. Mikrobiol., 4, 1933, 400; Stanier, Jour. Bact., 40, 1940, 630.) myx.o.coc.co.i'des or myx.o.coc.coi'-