220 



ORDER I. PSEUDOMONADALES 



5. Siderocapsa nionoeca Nauniann, 

 1922. (Siderocapsa monoica (sic) Naumann, 

 Kgl. Svensk. Vetensk. Akad. Handl., I, 62, 

 1922, 49.) 



mo.noe'ca. Gr. adj. monus alone, solitary; 

 Gr. noun oecus house, dwelling; M.L. adj. 

 monoecus solitary dwelling. 



Cells single, coccus-shaped or ellipsoidal, 

 0.5 to 0.7 micron in diameter, surrounded 

 by a more or less thick layer of iron and 

 manganese compounds in which, at least 

 when young, a rounded space is kept free. 

 The cell may be seen in this clear space. 

 Although the cells are found in great num- 

 bers in close proximity to each other, they 

 are distinctly isolated. Form iron and man- 

 ganese deposits on the surface of water 

 plants and submerged objects. 



Source: Isolated from the surface of 

 Poiamogeton nutans in Sweden. 



Habitat: Found in ponds, rivers and 

 waterworks; presumably widely distributed. 



6. Siderocapsa botryoides Beger, 1949. 

 (Zent. f. Bakt., I Abt., Orig., 15J^, 1949, 65.) 



bot.ry.o.i'des or bot.ry.oi'des. Gr. adj. 

 botryoides like a bunch of grapes. 



Cells coccus-shaped, spherical or ellipsoi- 

 dal, 0.6 to 0.8 micron in diameter. With 

 the capsule they are 0.8 to 2.0 microns in 

 diameter, lying singly only when young, 

 later forming spherical to clustered colonies 

 up to 0.3 cm long. 



The encrusted colonies form iron or 

 manganese floes. 



Source: Found in wells and waterworks 

 near Berlin. 



Habitat: Presumably widely distributed. 



Genus II. Siderosphaera Beger, 1944- 

 (Ber. d. deutsch. Bot. Ges., 62, (1944) 1950, 7.) 



Si.de.ro.sphae'ra. Gr. noun siderus iron; L. noun sphaera ball, sphere; M.L. fem.n. 

 Siderosphaera iron sphere. 



Small, coccoid cells, always occurring in pairs and embedded in a primary capsule. After 

 cell division the daughter pairs, with the primary capsules, are surrounded by a new, com- 

 mon capsule. This division continues up to the formation of eight pairs and results in a 

 round, ball-shaped Gloeocapsa-like stage which stores compounds of iron. A number of these 

 balls unite to form larger floes which may lie on the surface of bottom mud in fresh-water 

 ditches and swamps. 



The type species is Siderosphaera conglomerata Beger. 



1. Siderosphaera conglomerata Beger, 

 1950. (Ber. d. deutsch. Bot. Ges., 62, (1944) 

 1950, 7.) 



con.glo.me.ra'ta. L. part. adj. conglomer- 

 ates rolled together. 



Cocci, 1.0 to 1.2 microns in diameter, 

 each with a sheath about 2.0 microns in 

 diameter. These cells divide to form 2, 4 or, 

 at times, 8 pairs of cells in a clear, spherical, 

 gelatinous colony 8 to 10 microns in diam- 

 eter. 



Spherical to ellipsoidal floes containing 



these colonies may be as much as 500 mi- 

 crons in diameter. In general appearance 

 these floes resemble those formed b}^ Sidero- 

 capsa coronata found in the Upper Lake at 

 Lunz. When dilute HCl is added, the jelly- 

 like colonies may be liberated as the iron 

 salts dissolve. Manganese salts are appar- 

 ently not present. 



Source: Found in a small ditch near Lunz 

 (Austrian Alps). 



Habitat : Found on the surface of mud in 



Genus III. Sideronema Beger, 1941- 

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

 Si.de.ro.ne'ma. Gr. noun siderus iron; Gr. noun yiema thread; M.L. neut.n. Sideronema 

 iron thread. 

 Coccoid cells occurring in short chains which are enclosed in a gelatinous sheath. The 



