FAMILY PSEUDOMONADACEAE 209 



Microbiol., 5, 1938, 268.) A thermophilic produces endospores. However, spore- 



sulfate-reducing anaerobe which grows at formation appears to be the exception 



30 to 65°C. and which, according to rather than the rule. The pleomorphic, 



Starkey, produces endospores. Elion peritrichous, sporogenous, sulfate- 



described Vibrio thcrmodesulfuricans reducer is more rod-like than the asporo- 



(Cent. f. Bakt., II Abt., 63, 1924, 58) genous cultures and many cells of the 



which grows at temperatures no lower sporogenous cultures are Gram-positive 



than 30 to 40°C. and has an optimum of ^^.^^^^^^^ asporogenous cultures of Desnl- 



55°C. Morphologically it is much like r -i ■ i u- ■ r^ j.- 



^ ,^ , , ,,. • , rx f ovibr 10 desulfuncans are {jvam-negative, 



Desulfoinbrio desulfuricans and D. aes- " n ,• , ■ > , ,. , ,, ^i 



.. , ,, , ., ,, , ■,- r • all oi which leaves a question whether the 

 iuarii although the thermophilic form is ,r , • r. -77 



, , J 1-1 1 i-i I sporogenous suliate-reducer is a Bacillus 



shorter, more rod-like, less motile and 



more pleomorphic. According to Baars «^' ^^ Desulfoinbrto. Rittenberg (htudies 

 (loc. cit.), Vibrio thermodesulfuricam »" ^^^^"^e Sulfate-reducing Bacteria, 

 Elion can be acclimatized to grow at Thesis, Univ. Calif., 1941, 115 pp.) was 

 lower temperatures and it is found unable to adapt the marine sulfate re- 

 abundantly in environments where the ducer to grow at low salinities or at high 

 temperature has never been as high as temperatures, nor could it be induced 

 30 °C. This observation is confirmed by to form spores. 



Starkey (Arch. f. Microbiol., 9, 1938, Desulforibrio halohydrocarbonoclasti- 



268) who found further that the thermo- cus Zobell (U. S. Patent Xo. 2.413,278; 



philic form found in nature or developed Science News Letter, Jan. 1 1, 1947.) 



b}' acclimatization to higher temperatures From oil bearing rocks. 



Genus III. Cellvibrio Winogradshy* 

 (Ann. Inst. Pasteur, 4^, 1929. 577.) From M. L. cell, an abbreviation for cellulose; 



vibrio, vibrio. 

 Long slender rods, slightly curved, with rounded ends, show deeply staining gran- 

 ules which appear to be concerned in reproduction. Monotrichous. Most species 

 produce a yellow or brown pigment with cellulose. Oxidize cellulose, forming oxy- 

 cellulose. Growth on ordinary culture media is feeble. Found in soil. 

 The type species is Cellvibrio ochraceus Winogradsky. 



Key to the species of genus Cellvibrio. 

 I. Xo growth on glucose or starch agar. 



A. Ochre-yellow pigment produced on filter paper. 



1. Cellvibrio ochraceus. 

 II. Growth on glucose and starch agar. 



A. Poor growth on starch agar. 



1. Cream-colored pigment which becomes brown with age is produced on 

 filter paper. 



2. Cellvibrio flavescens. 



B. Abundant growth on starch agar. 



1. Scanty growth on glucose agar. 



a. Intense yellow pigment produced on filter paper. 



3. Cellvibrio fulvus. 



2. Abundant growth on glucose agar. 



a. X"o pigment produced on filter paper. 



4. Cellvibrio vulgaris. 



* Revised by Prof. Robert S. Breed, New York State Experiment Station, Geneva, 

 New York, Sept., 1937; no change. July, 1943. 



