FAMILY Vr. SIDEROCAPSACEAE 



221 



cell membrane contains an abundance of ferric hydroxide whereas the sheath is relatively 

 devoid of this substance. Non-motile and unattached. Found in iron-bearing waters. 

 The type species is Sidcronemn qlobuUfervm Beger. 



1. Sideroiiema globuliferiim Boger, 



1941. (Sideronemn glohulijern (sic) Beger, 

 Zent. f. Bakt., II Abt., 103, 1941, 321.) 



glob.u.li.fe'rum. L. divcv.noun cjlob^dus a, 

 small sphere, globule; L. v. fero to bear, 

 carry; M.L. adj. (/lobulijerus globule-bear- 

 ing. 



Cells coccoid, round to egg-shaped, 4.8 

 to 5.0 by 6.5 microns. Occur in chains (3 to 

 S cells) which are enclosed in a gelatinous 



sheath 1.6 microns thick; the cells in these 

 chains are non-confluent. Ferric hydroxide 

 is found in the cell membrane but only 

 sparingly so in the sheath. Non-motile and 

 unattached. 



Source: Found on gla.ss slides submerged 

 in spring water near Magdeburg, Germany. 



Habitat: Presumably widely distributed 

 in iron-bearing waters. 



Genus IV. Ferribacterium Brussoff, 1916. 



(Brussoff, Cent. f. Bakt., II Abt., .(5, 1916, 547; Sideroderma Naumann, Kungl. Svenska 

 Vetenskapsakad. Handl., 62, 1922, 54.) 



Fer.ri.bac.te'ri.um. L. nonn fernnn iron;Gr. dim. noun bacterium a small rod; M.L. 

 neut.n. Ferribacterium iron rodlet. 



Rods, with rounded or square ends, usually occurring in pairs, sometimes appearing singly 

 or in short chains. Motility occasionally observed; presumably the cells are polar flagellate. 

 In most cultures the cells are enclosed in a gelatinous capsule which is ordinarily surrounded 

 hy deposits of iron compounds. Produces a pellicle on the surface of liquid media and wa- 

 ter. Found in iron- or manganese-bearing water. 



The type species is Ferribacterium duplex Brussoff. 



1. Ferribacterium duplex Brussoft", 

 1916. (Brussoff", Cent. f. Bakt., II Abt., ^5, 

 1916, 5-i7; Sideroderma duplex Naumann, Kgl. 

 Svenska Vetenskapsakad. Handl., 62, 1922, 

 55 and 63.) 



du'plex. L. adj. duplex two-fold, double. 



Rods, with rounded ends, 1.2 by 2.5 to 

 5.0 microns, occurring usually in pairs, 

 sometimes singl}' or in short chains. Re- 

 ported as non-motile. Cells enclosed in a 

 gelatinous capsule which is ordinarily sur- 

 rounded by iron compounds. According to 

 Sauer (Inaug. Diss., Kiel, 1934, 33) the cells 

 are motile and Gram-negative. 



Peat-infusion agar: In old cultures the 

 gelatinous capsule is surrounded by a dark 

 sheath, never bj- an iron secretion; the 

 sheath is generally ellipsoidal. Irregular 

 forms are also found. 



Iron ammonium citrate broth: Pellicle 

 scarcely visible, appearing yellow under 

 the microscope. 



Iron peptone broth: Produces a barelj- 



visible pellicle which appears yellow under 

 the microscope. 



Water: A pellicle is formed which is 

 weakly iridescent or of a metallic sheen. 



Aerobic. 



Source: Isolated from an ochre-colored 

 sediment from two samples of tap-water 

 from Breslau labelled "Schwentniger" and 

 "Pirschamer". 



Habitat: Found in iron-bearing waters. 



2. Ferribacterium rectangulare (Nau- 

 mann, 1922) Beger, comb. nov. (Sideroderma 

 rectangulare Naumann, Kungl. Svenska 

 Vetenskapsakad. Handl., 62, No. 4, 1922, 54; 

 Sideroderma tenue Naumann, loc. cit.) 



rec.tang.u.la're. L. adj. rectus straight; 

 L. adj. angularis angular; M.L. adj. rectan- 

 gularis rectangular. 



Rods, with square ends, 0.5 by 3.0 mi- 

 crons. Embedded in capsular material in 

 pairs. Iron compounds deposited outside 



