oz 



ORDER I. PSEUDOMONADALES 



(Zur Kenntniss kleinster Lebensformen, 

 Bern, 1852, 174.) 



weis'se.i. Named for J. F. Weisse, a zoolo- 

 gist; M.L. gen. noun weissei of Weisse. 



Cells 4.2 by 5.7 to 11.5 microns (Perty); 

 also 3 to 4 by 7 to 9 microns (Issatchenko, 

 Borodin Jubilee Volume, 1929?, 8); transi- 

 tions to Chromatium okenii (Winogradsky, 

 Schwefelbacterien, Leipzig, 1888, 92); 

 transitions to Chromatium minus (Strzes- 

 zewski, Bull. Acad. Sci., Cracovie, Ser. B, 

 1913, 321). 



Illustrations: Winogradsky, op. cit., 1888, 

 PI. IV, fig. 1-2, Miyoshi, Jour. Coll. Sci., 

 Imp. Univ. Tokyo, Japan, 10, 1897, PI. 

 XIV, fig. 15. 



6. Chromatium cuculliferum Gickl- 

 horn, 1920. (Cent, f . Bakt., II Abt., 50, 1920, 

 419.) 



cu.cul.li'fe.rum. L. noun cucullus hood, 

 cap; L. V. few to bear; M.L. adj. cucullifer 

 cap-bearing. 



Cells 4 by 6 to 8 microns (Gicklhorn) ; 

 according to Bavendamm (Schwefelbak- 

 terien, Jena, 1924, 127), identical with 

 Chromatium warmingii forma minus. Gickl- 

 horn claims this organism to be colorless, 

 which appears very doubtful. 



Source: From the pond in the Annen 

 Castle Park, Graz, Austria. 



Habitat: Fresh-water ponds. 



Illustration: Gicklhorn, op. cit., 1920, 419, 

 fig. 2. 



7. Chromatium minus Winogradsky, 

 1888. (Schwefelbacterien, Leipzig, 1888, 99.) 



mi'nus. L. comp.adj. minor (neut. minus) 

 less, smaller. 



Cells 3 by 3.5 to 7 microns (Winograd- 

 sky) ; also 1.7 to 3 microns in width and up to 

 8.5 microns in length (Issatchenko, Borodin 

 Jubilee Volume, 1929?, 9); all transitions to 

 Chromatium weissei from which it cannot be 

 distinguished (Strzeszewski, Bull. Acad. 

 Sci., Cracovie, Ser. B, 1913, 321). 



Illustrations: Winogradsky, op. cit., 1888, 

 PI. IV, fig. 5; Miyoshi, Jour. Coll. Sci., Imp. 

 Univ., Tokyo, Japan, 10, 1897, PI. XIV, fig. 

 16; Issatchenko, Recherches sur les microbes 

 de I'ocean glacial arctique, Petrograd, 1914, 

 PI. II, fig. 10-11. 



8. Chromatium vinosum (Ehrenberg, 

 1838). Winogradsky, 1888. {Monas vinosa 

 Ehrenberg, Die Infusionstierchen, Leipzig, 

 1838, 11; Winogradsky, Schwefelbacterien, 

 Leipzig, 1888, 99.) 



vi.no'sum. L. adj. vinosus full of wine. 



Cells 2 by 2.5 to 5 microns; also 1.4 to 3 by 

 1.5 to 5 microns (Jimbo, Botan. Magaz. 

 Tokyo, 51, 1937, 872); 1.7 to 2 by 2 to 9 

 microns (Issatchenko, Borodin Jubilee 

 Volume, 1929?, 9) ; or 1 to 1.3 microns by 2.5 

 to 3 microns (Schrammeck, Beitr. Biol. d. 

 Pflanzen, 22, 1935, 317). Jimbo considers 

 Thioderma roseum Miyoshi to be identical 

 with Chromatium vinosum. 



Illustrations: Winogradsky, op. cit., 1888, 

 PI. IV, 6-7; Miyoshi, Jour. Coll. Sci., Imp. 

 Univ. Tokyo, Japan, 10, 1897, PI. XIV, fig. 

 17; Nadson, Bull. Jard. Imp. Botan., St. 

 Petersbourg, 12, 1912, PI. Ill, fig. 1-2. 



9. Chromatium violaceum Perty, 1852. 

 (Zur Kenntniss kleinster Lebensformen, 

 Bern, 1852, 174.) 



vi.o.la'ce.um. L. adj. violaceus violet- 

 colored. 



Cells about 2 by 2 to 3 microns. Accord- 

 ing to Cohn (Beitr. Biol. Pfl., 1, Heft 3, 

 1875, 166), probably identical with Chro- 

 matium vinosum. Apparently includes var- 

 ious sizes. 



10. Chromatium molischii (Bersa, 

 1926) van Niel, 1948. {Pseudomonas molischii 

 Bersa, Planta, 2, 1926, 375; van Niel, in 

 Manual, 6th ed., 1948, 858.) 



mo.li'schi.i. Named for H. Molisch, an 

 Austrian botanist; M.L. gen. noun molischii 

 of Molisch. 



Cells about 2 by 2.5 to 8 microns. Sup- 

 posedly contain calcium carbonate as in- 

 clusions. 



Illustration: Bersa, op. cit., 1926, 376, fig. 

 3. 



11. Chromatium gracile Strzeszewski, 

 1913. (Bull. Acad. Sci., Cracovie, Ser. B, 

 1913, 321.) 



gra'ci.le. L. adj. gracilis thin, slender. 



Cells 1 to 1.3 by 2 to 6 microns; also to 1.5 

 microns in width (Issatchenko, Etudes mi- 

 crobiologiques des Lacs de Boue, Leningrad, 

 1927, 114). 



Illustration: Strzeszewski, op. cit., 1913, 



