216 



ORDER I. PSEUDOMONADALES 



Tidskr., 27, 1933, 360; not GaUionella ferru- 

 ginea Ehrenberg, Die Infusionthierchen, 

 1838, 166; Beger, Ber. d. deutsch. Bot. Ges., 

 52, 1949, 9.) 



um.bel.la'ta. L. noun iimhella umbrella; 

 M.L. adj. umbellatus umbel-like. 



Five to six cells are formed at the end of 

 the stalks before separation. The cells are 

 kidnej^-shaped and 1.0 by 2.0 microns in 

 size. The stalks then divide into 5 to 6 

 branches forming a simple umbel. This proc- 

 ess of cell division and growth of branches 

 continues until finally the whole mass ap- 

 pears composed of umbels. 



Source: From leaf mold found in streams 

 in British-Gambia. 



Habitat: Found in tropical, iron-bearing 

 streams. 



5. GaUionella infurcata Beger, 1937. 



(Spiro-phyUum sp., Suessenguth, Cent. f. 

 Bakt., II Abt., 1927, 69 and 339; Beger, Gas- 

 und Wasserfach, 80, 1937, 887; Spirophyllum 

 infurcatum Beger, ibid., 889.) 



in.fur.ca'ta. L. prep, in in; L. nonn furca 

 fork; M.L. adj. furcatus forked; M.L. adj. 

 infurcatus forked. 



Stalks twisted but not branched. Cells 

 coccoid, 1 micron in diameter. After fission 

 into two cells, they become detached from 

 the stalk. 



Source: Found in water basins in the 

 Botanical Garden of Miinchen-Nymphen- 

 burg. 



Habitat: Found in iron-bearing waters. 



Genus. III. Siderophaciis Beger, 1944- 

 (Ber. d. deutsch. Bot. Ges., 61, 1944, 12.) 



Si.de.ro'pha.cus. Gr. noun siderus iron; Gr. noun phacus lentil; M.L. mas.n. Sidero- 

 phaciis iron lentil. 



The stalks are horn-shaped, without branches, and do not form twisted bands; they are 

 round to ovoid in transverse section. Cells biconcave or rod-like; after division they sepa- 

 rate from the stalk. Ferric hydroxide is stored in the stalks. 



The type species is Siderophaciis corneolus (Dorff) Beger. 



1. Siderophaciis corneolus (Dorff, 1934) 

 Beger, 1944. (GaUionella corneola Dorff, Die 

 Eisenorganismen, Pflanzenforschung, Heft 

 16, 1934, 25; Beger, Ber. d. deutsch. Bot. 

 Ges., 61, 1944 12.) 



cor.ne'o.lus. L. adj. corneolus horny, firm. 



Stalks 15 to 30 microns long, broader at 



the top than at the base. Three to eight 

 stalks arise from a broad holdfast. Cells 

 0.6 to 1.0 by 2.5 to 3.0 microns. 



Source: Found in an iron-bearing rivulet 

 near Lot-Malmby, Central Sweden; also 

 found near Berlin. 



Habitat: Found in iron-bearing waters. 



Genus IV. Nevskia Famintzin, 1892. 

 (Bull. Acad. Imp. Sci., St. Petersb., Ser. IV, 34 (X.S. 2), 1892, 484.) 



Nev'ski.a. Neva a river at Leningrad; M.L. fem.n. Nevskia of the Neva. 



Stalked bacteria, the long axis of the rod-shaped cells being set at right angles to the axis 

 of the stalk. Stalks lobose, dichotomously branched and composed of gum. Multiplication 

 of cells by transverse binary fission. Grow in zoogloea-like masses in water. 



The type species is Nevskia ramosa Famintzin. 



1. Nevskia ramosa Famintzin, 1892. 

 (Bull. Acad. Imp. Sci., St. Petersb., S^r. 

 IV, 34 (N. S.^), 1892,484.) 



ra.mo'sa. L. adj. ramosus branched. 



Globular, bush-like or plate-like colonies 

 of gummy consistency which float upon the 

 surface of water. Colonies composed of 



gummy material arranged in dichotomously 

 branched stalks arising from a common 

 base, with the bacterial cells contained in 

 the gum, a single cell at the tip of each 

 stalk. At times cells are set free from the 

 stalks to start new colonies. 

 Rod-shaped cells set with their long axis 



