FAMILY V. MYXOCOCCACEAE 



889 



Source : Isolated from goat dung and from 

 soil from Ames, Iowa. 



Habitat: Soil. Decomposes organic mat- 

 ter, especially bacterial cells in dung. 



Illustrations: Beebe {ibid., PI. II, Figs. 5 

 and 6; PI. IV, Fig. 18). 



6. Chondrococcus cerebriforniis (Ko- 

 fler, 1913) Jahn, 1924. (Myxococcus cerebri- 

 forniis Kofler, Sitzber. d. kais. Wiss. Wien, 

 math.-nat. Klasse, Abt. I, 122, 1913, 866; 

 Jahn, Beitriige zur bot. Protistologie. I, 

 Die Polyangiden. Geb. Borntraeger, Leip- 

 zig, 1924, 86.) 



ce.reb.ri.for'mis. L. noun cerebrum brain; 

 L. noun/or?«« shape; M.L. adj. cerebri forijus 

 brain-like. 



Vegetative cells: Rods 4 to 12 microns. 



Fruiting bodies: About 1 mm long, 

 clumped masses with swollen upper surface, 

 brain-like, violet-rose, often lead-gray. 

 Microcysts 1.1 to 1.6 microns. Jahn (loc. 

 cit.) suggests that this may be Archangium 

 gephyra. 



Source: Isolated from hare dung in the 

 vicinity of Vienna. 



Habitat: Found in the dung of various 

 animals. 



Illustrations: Kofler (op. cit., 1913, PI. 2, 

 Figs. 7 and 8). 



7. Chondrococcus coluinnaris (Davis, 

 1923) Ordal and Rucker, 1944. (Bacillus 

 columnnris Davis, Bull. U. S. Bur. Fisheries, 



38, 1923, 261; Ordal and Rucker, Proc. Soc. 

 Exper. Biol, and Med., 56, 1944, 18; also see 

 Fish and Rucker, Trans. Amer. Fish. Soc, 

 73rd Annual Vol. for 1943, 1945, 32.) 



co.lum.na'ris. L. adj. columnaris rising 

 like a pillar. 



Vegetative cells: Flexible, weakly refrac- 

 tive. Gram-negative rods, 0.5 to 0.7 by 4.0 

 to 8.0 microns. Creeping motion observed 

 on solid media, and flexing movements ob- 

 served in liquid media. 



Microcysts: 0.7 to 1.2 microns, spherical 

 to ellipsoidal. 



Fruiting bodies: A peculiar type of fruit- 

 ing body is formed in liquid media. Where 

 organisms are in contact with infected tis- 

 sues or with scales, columnar and some- 

 times branched fruiting bodies are produced 

 in which t_ypical microcysts develop in 7 to 

 10 days. 



Physiology: Growth best on 0.5 to 0.9 

 per cent agar with 0.25 to 0.50 per cent Bac- 

 totryptone at pH 7.3. Colonies on tryptone 

 agar are yellow, flat and irregular; edge 

 uneven with swarming apparent. Gelatin 

 liquefied rapidly. Indole not produced. Ni- 

 trites not produced from nitrates. Starch, 

 cellulose and agar not attacked. Sugars not 

 fermented, but glucose is oxidized. 



Source: First described as the cause of a 

 bacterial disease of warm-water fishes (Da- 

 vis, op. cit., 1923, 261), and later in finger- 

 lings of the cold-water blue-black salmon 

 (Oncorrhynchus nerka). Transmissible to 

 salmonid fishes. 



Genus III. Angiococcus Jahn, 1924- 

 (Beitrage zur bot. Protistologie. I, Die Polyangiden. Geb. Borntraeger, Leipzig, 1924, 89.) 



An.gi.o.coc'cus. Gr. noun angium vessel; Gr. noun coccus a berry; M.L. mas.n. Angio- 

 coccus vessel coccus. 



Fruiting body consists of numerous, round (disc-shaped) cysts; cyst wall thin, micro- 

 cysts within. 



The type species is Angiococcus disciformis (Thaxter) Jahn. 



Key to the species of genus Angiococcus. 



I. Cysts yellow to dark orange-yellow^; disc-shaped; 35 microns in diameter. 



1. Angiococcus disciformis. 

 II. C3\sts colorless to yellow; round; u]) to 15 microns in diameter. 



2. Angiococcus cellulosum. 



1. Angiococcus jHsciformis (Thaxter, Thaxter, Bot. Gaz., 87, 1904, 412; Jahn, 

 1904) Jahn, 1924. (Myxococcus disciformis Beitrage zur bot. Protistologie. I, Die Poly- 



