9. Leptothrix volubilis Cholodny, 1924. {Lynghya epiphytica Hieronymus, in Kirch- ner, in Engler and Prantl, Die naturl. Pflanzenfam., 1, la, 1898, 67; Cholodny, Zent. f. Bakt., II Abt., 61, 1924, 292; Chlamydothrix epiphytica Naumann, Ber. d. deutsch. bot. Gesellsch., 46, 1928, 141; not Chlamydothrix epiphytica Migula, Syst. d. Bakt., 3, 1900, 1033; Leptothrix epiphytica Dorff, Die Eisenorganismen, Pflanzenforschung, Heft 16, 1934, 32; not Leptothrix epiphytica Schoenichen and Kal- berlah, Ej'ferth's Einfachste Lebensfor- men, 3rd ed., 1900, 46.) vo.lu'bi.lis. L. adj. volubilis twisting spirally around a support, twining. Cells rod-shaped and colorless, measuring 1 by 2 microns. The cells are enclosed in long, cylindrical, unbranched trichomes which grow in a spiral fashion around threads of Oe(?o^om?/m, Tolypothrix, etc. The bacterial trichomes are, in turn, surrounded by cjdindrical, ochre-yellow sheaths, about 3 microns in diameter, which are encrusted with iron. The cells m&y leave the sheaths as in Leptothrix ochracea. Habitat : Found in fresh water containing algae.
10. Leptothrix skujae Beger, 1953. {Leptothrix tenuissima Skuja, Symbolae Botanicae Upsaliensis, 9, 1948, 33; not Leptothrix tenuissima Naegeli, in Kiitzing, Species Algarum, 1849, 265; Beger, in Beger and Bringmann, Zent. f. Bakt., II Abt., 107, 1953,331.) sku'jae. M.L. gen. noun skujae of Skuja; named for H. Skuja, the Swedish algologist who first described this species. Unattached trichomes, generally without false branching, spirally wound together, 0.3 to 0.4 micron in diameter. The sur- rounding sheath is as much as 18 microns in diameter and tapers toward the tip. Cells rod-shaped and colorless, with a few gran- ules lying in chains. Resembles Leptothrix discophora Dorff. Source: From Store Halsjon, Prov. Upp- land, Sweden. Found between other water plants and in the plankton. Habitat: Found near the shore in lakes.
11. Leptothrix winogradskii Cataldi, 1939. (Estudio Fisiologico y Sistemdtico de Algunas Chlamydobacteriales. Thesis, Uni- versity of Buenos Aires, 1939, 58.) wi.no.grad'ski.i. M.L. gen. noun wino- gradskii of Winogradsky; named for S. Winogradsky, a Russian bacteriologist. Cells 0.9 micron in diameter. Motile, presumably polar flagellate. Trichomes very long, never attached. Sheath 1.5 microns thick. Not acid-fast. Gram-negative. Gelatin not liquefied. Iron citrate and ammonium agar colonies: Very filamentous, terminate in spirals, lusterless red. Manganese acetate agar colonies: Very filamentous, red to bright chestnut in color. Iron citrate and ammonium agar slant: Colonies quite large and distinct, pale white. Manganese acetate agar slant: Filaments long, red to chestnut-colored and inter- twined much as are cotton fibers. Peptone and manganese acetate broth: Filaments quite long and intertwined like cotton fibers. Indole not produced. Hydrogen sulfide not produced. Acetylmethylcarbinol not produced. Nitrites produced from nitrates. Optimum temperature, 37° C. Optimum pH, between 5.0 and 9.8. Aerobic; growth favored by the presence of COo . Source: Isolated from fresh water in the neighborhood of Buenos Aires. Habitat: Presumably widely distributed.
12. Leptothrix pseudovacuolata (Per- filiev, 1925) Dorff, 1934. (Spirothrix pseudo- vacuolata Perfiliev, Verh. d. Int. Verein. f. theor. u. angew. Limnologie, 1925, Stutt- gart, 1927; Dorff, Die Eisenorganismen, Pflanzenforschung, Heft 16, 1934, 36.) pseu.do. va.cu.o.la'ta. Gr. adj. pseudes false; L. adj. vacuus empty; M.L. noun vacuola a vacuole; M.L. adj. pseudovacuola- tus having false vacuoles.
