834 



MANUAL OF DETERMIXATIVE BACTERIOLOGY 



that the cells are larger and the gelatin- 

 ous capsule is less sharply defined. 



Source: Isolated from Spirogyra sp. 



Habitat: Epiphytic on fresh water 

 plants. 



Appendix: Two additional species 

 have been placed in the genus Sidero- 

 capsa by later investigators: 



Siderocapsa coronaia Redinger. 

 (Arch. f. Hydrobiol., ^2, 1931, 410.) 

 From lake water. A free floating form. 



Siderocapsa monoica Naumann. 

 (Kungl. Svenska Vetenskapsakad. 

 Handl., I, 62, 1921, Part 4, 49; quoted 

 from Cholodny, Die Eisenbakterien, 

 Jena, 1928, 59.) Found on Polamogeton 

 nalans in Sweden. Cells occur singly. 



Genus II. Sideromonas Cholodny. 



(Ber. d. deutsch. Bot. Ges., 40, 1922, 326; also Die Eisenbakterien, Jena, 1926, 55.) 

 From Greek sideros, iron and ynonas, a unit. 



Small cocci or coccobacteria which grow in chains in gelatinous masses containing 

 ferric hydroxide attached to thread algae, generally of the genus Conferva. 

 The type species is Sideromonas confervarum Cholodny. 



1. Sideromonas confervarum Cho- 

 lodnj'-. (Ber. d. deutsch. Bot. Ges., 40, 

 1922, 326; also Die Eisenbakterien, Jena, 

 1926, 55; Siderocystis confervarum Nau- 

 mann, quoted from Dorff, Die Eisenor- 

 ganismen, Pflanzenforschung, Heft 16, 

 1934, 13.) From Latin, of the genus 

 Conferva. 



Coccobacteria: 0.5 to 0.6 by 0.8 to 0.9 

 micron, occurring in chains embedded 

 in gelatinous masses, 10 to 100 microns 

 in diameter. Chains become visible 

 when the gelatinous mass is treated with 

 formalin followed by dilute HCl, washed 

 in water, and stained with gentian violet 

 or carbol fuchsin. No motility ob- 

 served. 



Form deposits of ferric hydroxide in 

 the gelatinous mass surrounding the 

 bacteria. 



Source: Found on the surface of thread 

 algae in water containing iron salts. 



Habitat: Widely distributed on fresh 

 water green algae. 



Appendix : Additional species of simple, 

 sessile, non-filamentous bacteria which 

 cause deposits of ferric hydroxide have 

 been described. The majority are rod- 

 shaped bacteria and resemble Sidero- 

 monas. The list follows: 



Ferribacterium calceum Brussoff. 



(Brussoff, Cent. f. Bakt., II Abt., 48, 

 1918, 208; Siderobactcr calceum Naumann, 

 Kungl. Svenska Vetenskapsakad. 

 Handl., I, 62, Part 4, 1921, 53 and 63; 

 Bacillus calceus De Rossi, Mici'obiol. 

 Agraria e Technica, Torino, 1927, 903.) 

 From slime in drainage ditches at 

 Aachen. 



Ferrihaclerium duplet Brussoff. 

 (Brussoff, Cent. f. Bakt., II Abt., 45, 

 1916, 547; Sideroderma duplex Naumann, 

 Kungl. Svenska Vetenskapsakad. 

 Handl., 1, 62, Part 4, 1921, 53 and 63; 

 Bacterium duplex De Rossi, Microbiol. 

 Agraria e Technica, Torino, 1927, 903.) 

 A non-motile, diplobacterium from wa- 

 ter samples from Breslau (Schwentniger 

 and Pirschamer) . 



Naumanniella minor Dorff. (Die 

 Eisenorganismen, Pflanzenforschung, 

 Heft 16, 1934, 21.) From iron-bearing 

 spring water at Worms (Rhein). 



Naumanniella neustonica Dorff. (Die 

 Eisenorganismen, Pflanzenforschung, 

 Heft 16, 1934, 20.) From Neuston on 

 Tuefelsee near Freienwalde. Dorff {loc. 

 cit.) indicates this species as the type 

 for a new genus Naumanniella. 



Siderobactcr duplex Naumann. 



(Kungl. Svenska Vetenskapsakad. 

 Handl., I, 62, Part 4, 1921, 55.) From 

 Aneboda region, Sweden. 



