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. Gallionella 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. Siderophacus 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. Siderophacus 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. Siderophacus 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., Sér. IV, 34 (N.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
