FAMILY VI. BACTEROIDACEAE 



431 



see DeToni and Trevisan, in Saccardo, 

 Sylloge Fungorum, 8, 1889, 1025; Ristella 

 putrcdinis Prevot, Ann. Inst. Past., 60, 1938, 

 291.) 



put.re'di.nis. L. noun piitredo putridity; 

 M.L. gen. noun putredinis of putridity. 



Straight rods, 0.8 by 3.0 to 4.0 microns, 

 with rounded ends, one of which may be 

 swollen. Non-motile. Gram-negative. 



Gelatin: Liquefaction. Foul odor. 



Agar: Deep colonies small, round to ar- 

 borescent. No gas. 



Broth: Rapid growth; uniform turbidity. 

 No gas ; foul odor. 



Milk: Rapid growth; casein precipitated 

 and peptonized. Small amount of gas; foul 

 odor. 



Coagulated serum: Digested. 



Indole is produced. 



Hydrogen sulfide produced in broth. 



No acid or gas from carbohydrates. 



Anaerobic. 



Optimum temperature, 37° C. 



Pathogenicity : Produces local abscesses in 

 animals when mixed with Escherichia coli. 



Source: Fifteen strains were isolated from 

 cases of acute appendicitis. 



Habitat: From cases of acute appendicitis 

 and presumably found in similar infections 

 in man. 



16. Bacteroides uncatus Eggerth and 

 Gagnon, 1933. (Eggerth and Gagnon, Jour. 

 Pact., 25, 1933, 404; Ristella uncata Prevot, 

 Ann. Inst. Past., 60, 1938, 291.) 



un.ca'tus. L. adj. uncatus hooked at the 

 tip. 



Rods, ordinarily 5 to 8 microns long, with 

 extreme variations in size and form; curved 

 and hooked forms are common. Non-motile. 

 Gram-negative. 



Gelatin: Liquefaction in 16 daj's. 



Blood agar colonies: Very minute and 

 transparent. 



Broth: Turbid; growth is slow and light. 



Milk: Not acidified or coagulated. 



Indole not produced. 



Hydrogen sulfide not produced. 



Acid but no gas after 8 to 30 da3^s of incu- 

 bation from dextrin, fructose, galactose, 

 glucose, lactose, maltose, raffinose, rham- 

 nose, salicin, starch and sucrose. No acid 

 from esculin, amygdalin, arabinose, cello- 



biose, glycerol, glycogen, inulin, mannitol, 

 mannose, melezitose, sorbitol, trehalose or 

 xylose. 



Nitrites not produced from nitrates. 



Peptone: No gas. 



Anaerobic. 



Non-pathogenic for white mice or rabbits. 



Source: One strain was isolated from 

 human feces. 



Habitat: Probabl}' the intestinal canals 

 of mammals. 



17. Bacteroides lumidus Eggerth and 

 Gagnon, 1933. (Eggerth and Gagnon, Jour. 

 Pact., 25, 1933, 405; Ristella tumida Prevot, 

 Ann. Inst. Past., 60, 1938, 292.) 



tu'mi.dus. L. adj. tumidus swollen. 



Small, thick, ellipsoidal rods, 1.0 to 1.5 

 microns long, occurring singly. On glucose 

 broth there are many swollen forms, 1.0 to 

 4.0 by 1.5 to 10.0 microns, which stain ir- 

 regularly; the bodies of these swollen forms 

 are usually very pale, with only the ends 

 staining. Non-motile. Stain solidly. Gram- 

 negative. 



Gelatin: Liquefaction in 12 to 20 days. 



Blood agar colonies: Soft, grayish, ele- 

 vated colonies, 1 mm in diameter. 



Broth: Heavy, diffuse growth. 



INIilk: Acidified but not coagulated. 



Indole not produced. 



Hydrogen sulfide is produced. 



Acid but no gas from de.xtrin, fructose, 

 galactose, glucose, glycogen, inulin, lactose, 

 maltose, mannose, rafRnose, sorbitol, starch 

 and sucrose. No acid or gas from esculin, 

 amygdalin, arabinose, cellobiose, glycerol, 

 mannitol, melezitose, rhamnose, salicin, 

 trehalose or xylose. 



Nitrites not produced from nitrates. 



Peptone: No gas. 



Anaerobic. 



Non-pathogenic for white mice or rabbits. 



Source: Four strains were isolated from 

 human feces. 



Habitat: Probably the intestinal canals 

 of mammals. 



18. Bacteroides exiguus Eggerth and 

 Gagnon, 1933. (Eggerth and Gagnon, Jour. 

 Bact., 25, 1933, 407; Ristella exigua Prevot, 

 Ann. Inst. Past., 60, 1938, 292.) 



