FAMILY SIDEROCAPSACERE 



833 



Growing upon firm substrates in 

 water. Not cultivated on artificial 

 media. 



Habitat: Water. 



Appendix: Henrici and Johnson (Jour. 

 Bact., SO, 1935, 62) list the following as 

 possibly belonging in this genus: 



Bacillus fiagellatus Omeliansky. 

 (Jour. Microbiol. (Russian), 1, 1914, 24.) 

 Probably the same as the organism de- 

 scribed by Jones (Henrici and Johnson, 

 loc. cit., 62). 



Polar flagellate organism, Jones. 

 (Cent. f. Bakt., II xVbt., U, 1905, 459.) 

 From water and sewage. 



Vibrioihrix to7isillaris Tunnicliff and 

 Jackson. (Tunnicliff and Jackson, Jour. 

 Inf. Dis., 46, 1930, 12; see Henrici and 

 Johnson, loc. cit., 62.) From tonsil 

 crj^pts. See p. 219 for a different view- 

 point regarding this species. 



Six additional types are figured but 

 not named by Henrici and Johnson 

 (loc. cit., 84). 



FAMILY IV. SIDEROCAPSACEAE PRIBRAJM. 



(Tribe Siderocapseae Buchanan, Jour. Bact., 2, 1915, 615; Pribram, Jour. Bact., 

 18, 1929, 377.) 



Cells spherical or ovoid. Motile stages, if any, unknown. Xot yet cultivated on 

 artificial media. Thick capsules enclosing the cells become encrusted with ferric 

 hydroxide. Attached to the surface of leaves and other parts of water plants. 



Key to the genera of family Siderocapsaceae. 



I. Cocci, occurring singly and in groups, and embedded in small irregular gelatinous 

 masses. 



Genus I. Siderocapsa, p. 833. 

 II. Coccobacteria, occurring in chains, and embedded in large gelatinous masses. 



Genus II. Sideromonas, p. 834. 



Genus I. Siderocapsa Molisch. 



(Ann. Jard. Bot. Buitenzorg, 2 Ser., Supp. 3, 1909, 29; also Die Eisenbakterien, 

 Jena, 1910, 11.) From Greek sideros, iron and Latin capsa, box. 



One to many spherical to ovoid small cells embedded in a mass of capsular material 

 surrounded by ferric hydroxide. Best recognized by staining with Schift''s reagent. 

 Motility unknown. Grow attached to the surface of water plants. 



The type species is Siderocapsa treubii Molisch. 



1. Siderocapsa treubii Molisch. (Ann. 

 Jard. Bot. Buitenzorg, 2 Ser., Supp. 3, 



1909, 29; also Die Eisenbakterien, .[ena, 



1910, 11.) Named for Prof. Treub, the 

 director of the tropical garden at Buiten- 

 zorg, Java. 



Cocci: 0.4 to 0.6 micron in diameter 

 embedded in zoogloeal masses sur- 

 rounded by ferric hydroxide. 



Deposit ferric hydroxide on the sur- 

 faces of water plants. 



Source: Found attached to the roots, 

 root hairs and leaves of water plants 



(Elodea, Xymphaea, Sagittaria, Salvinia, 

 etc.). 



Habitat: Widely distributed, on fresh 

 water plants. 



2. Siderocapsa major Alolisch. (Ann. 

 Jard. Bot. Buitenzorg, 2 S^r., Supp. 3, 



1909, 29; also Die Eisenbakterien, Jena, 



1910, 13.) From Latin major, larger. 

 Cells colorless, coccus-like short rods, 



0.7 by 1.8 microns. A colony consists of 

 2 to 100 or more cells. 



Similar to Siderocapsa treubii, except 



