Page:Bergey's manual of determinative bacteriology.djvu/249

 (Kungl. Svenska Vetenskapsakad. Handl., 62, 1922, 55.) li.ne.a'ris. L. adj. linearis linear. The type species of genus Siderobacter Naumann. Cells 1.0 by 5.0 microns after the encrust- ing iron compounds have been dissolved away with dilute HCl. Opaque, encrusted cells, 1.2 b}- 7.0 microns. Always occur singl}' in contrast to the larger-celled Siderobacter duplex, where the cells occur in pairs. Source: Found in the Aneboda region in Sweden. Habitat: Found in surface films and on submerged objects.

4. Siderobacter duplex Naumann, 1922. (Kungl. Svenska Vetenskapsakad. Handl., 62, No. 4, 1922, 55.) du'plex. L. adj. duplex two-fold, double. Cells, 1.5 by 3.5 microns after encrusting iron compounds are removed with dilute HCl, occurring in pairs. Source: Found in the Aneboda region in Sweden. Habitat: Found in surface films on the water of swamps and small streams.

5. Siderobacter latus Beger, 1941. (Zent. f. Bakt., I Abt., Orig., 154, 1949, 63 and 66.) la'tus. L. adj. latus broad. Straight or occasionally curved cells, 2.5 b}^ 6.0 to 15.0 microns, usually occurring singly. Participate in the formation of iron and lime concretions. Source: Found on concretions on the brick walls of two wells suppljang a rapid sand filter near Berlin, Germany. Habitat : Found in the cool waters of deep wells.

Fer.ro. ba.cil'lus. L. noun ferrum iron, here meaning ferrous iron; L. dim.noun bacillus a small rod; M.L. noun Ferrobacillus ferrous-iron rodlet.

Short, plump, rod-shaped cells occurring singly and in pairs, seldom in chains; the cells are not united to form colonies. Oxidize ferrous iron to the ferric state in acid environments. Optimum reaction, pH 3.5.

The type species is Ferrobacillus ferrooxidans Leathen and Braley.

1. Ferrobacillus ferrooxidans Leathen and Braley, 1954. (Ferrous iron oxidizing bacterium, Leathen, IMcIntyre and Braley, Bact. Proc. 52nd General Meeting, Soc. of Amer. Bact., 1952, 15; also see Leathen, Braley and Mclntj're, Appl. Microbiol., 1, 1953, 65; Leathen and Braley, Bact. Proc. 54th General Meeting, Soc. of Amer. Bact., 1954, 44.) fer.ro.o'xi.dans. L. noun ferruni iron; Gr. adj. oxys sharp, acid; M.L. v. oxido to oxidize or make acid; M.L. part. adj. fer- rooxidans iron-oxidizing. Rods 0.6 to 1.0 by 1.0 to 1.6 microns. Motile, presumably polar flagellate. Gram- negative. Ferrous iron-silica gel : Colonies are small and raised with irregular margins. Young colonies are glistening and tan, but gradu- ally become granular and brown with oxidizing iron. A tan to brown area of oxidized iron is frequently found around the colony. Liquid ferrous iron medium (Leathen, Mclntyre and Braley, Science, 114, 1951, 280): Rapidly oxidized; forms a precipitate of ferric hydroxide or basic ferric sulfate. Acid thiosulfate liquid medium: Not oxidized. Optimum reaction, pH 3.5. O.xidation retarded below pH 2.2 and above pH 4.6. Optimum temperature, between 15° and 20° C. Strictly autotrophic. Derives energy by the o.xidation of ferrous iron to the ferric state. Utilizes the CO2 of the atmosphere as a source of carbon. Aerobic.