1044 MAXUAL OF DETERMIAATIVE BACTERIOLOGY 



spore masses of light milky yellow color. Myxococcus ovalispurus in an incubator 



These are often raised on a poorly de- (presumably at 37 °C). 



veloped stalk. This stalk always shows Source and habitat : Develops on rabbit 



some bacterial cells remaining, and in dung (sterilized) on soil in Poland 



this and color is differeniated from (Krzemieniewski). 



M. stipitatus. From the base of the ^. tt , i t^, , • , . , 



,. ^t J, ^1 u X X Appendix: Rippel and Flehmig (Arch, 



stalk or direc ly from the substrate one ^ Mikrobiol., 4, 1933, 229) describe a 



or more small fruitmg bodies develop. ^^^^, ^^^^ ^^ ^^^^^.^ ^^U^l^^^ destroying 



Spores are oval, sometimes irregularly |,acteria under the new genus name of 



spherical, 1.3 to 1.9 by 1.0 to 1.4 microns. Hersonia. This genus includes a single 



In culture retains its differences from species, Itersonia ferruginea. This or- 



Myxococcus stipitatus. The latter sporu- ganism shows similarity to those in- 



lates best at room temperature, but eluded in Myxococcus. 



Genus II. Chondrococcus Jahn. 



(Jahn, Beitrage zur botan. Protistologie. I. Die Polyangiden, Geb. Borntraeger, 

 Leipzig, 1924; Dactylocoena Enderlein, Bakterien-Cyclogenie, Berlin, 1924, 243.) 



Synonymy: A segregate from Myxococcus Thaxter. 



Etymology: Greek chondros, grain and kokkos, ball (coccus). 



Diagnosis: Spores embedded in a viscous slime which hardens. Fruiting bodies 

 divided by joints or constrictions, often branched, usually relatively small. 



Seven species are included, of which the first described by Thaxter and best de- 

 scribed, Chondrococcus coralloides (Thaxter) Jahn, may be designated as the type. 

 The first species listed by Jahn is regarded as doubtful and should not be regarded 

 as the type for there is no evidence that Jahn ever saw the species. 



Key to the species of genus Chondrococcus. 



I. Not parasitic on fish. 



A. Erect, simple or somewhat branched fruiting bodies. 



1. Secondary fruiting bodies not produced. 



a. Fruiting bodies constricted or jointed. 



1. Chondrococcus coralloides. 

 aa. Fruiting body simple, columnar, club- or cushion-shaped. 



b. Fruiting body thick below, lesser above. 



2. Chondrococcus cirrhosis. 

 bb. Not as in b. 



c. Spores 1.6 to 2.0 microns in diameter, 

 d. Fruiting body cushion-shaped. 



3. Chondrococcus megalosporus . 

 dd. Fruiting body branched. 



4. Chondrococcus tnacrosporus. 



cc. Fruiting body smaller below, above club-shaped. Spores 1.0 

 to 1.2 microns in diameter. 



la. Chondrococcus coralloides var. 

 clavatus. 



2. Secondary fruiting bodies arise as bud-, finger- or coral-like growths from 



primary fruiting body. 



5. Chondrococcus blasticus. 



B. Recumbent, simple swelling or cyst heap constituting the fruiting body. 



