FAMILY BACTERIACEAE 



629 



3. Agarbacterium reducans Angst. 

 (Puget Sound Biol. Sta. Pub., 7, 1929, 

 49.) 



Short rods with rounded ends, 0.6 by 

 0.8 micron, occurring singly and in pairs. 

 Motile. No capsules. Gram-negative. 



Fish gelatin colonies : Circular, sunken, 

 entire, crateriform, granular. 



Fish gelatin stab: Crateriform lique- 

 faction, growth only near surface. 



Fish agar slant: Abundant, filiform, 

 flat, glistening, smooth, opaque, white, 

 butyrous growth. 



Fish agar colonies: Moderate, circular, 

 smooth, flat, entire, granular, white to 

 buff or colorless. 



Digests agar; cellulose not attacked. 



Fish broth: Turbid, no sediment, no 

 surface growth. 



Potato: No growth. 



Nitrites produced from nitrates. 



No H2S or indole formed. 



Plain milk unchanged. 



Acid from sucrose, arabinose, rham- 

 nose and mannitol . No acid from .xylose 

 or lactose. 



Starch is hj'drolyzed. 



Aerobic. 



Optimum temperature 25° to 28°C; 

 thermosensitive. 



Source: Isolated from NercocysLis 

 luetkeana. 



Habitat: On marine algae. 



4. Agarbacterium viscosum Angst. 

 (Pugot Sound P.iol. Sta. Pub., 7, 1929, 

 49.) 



Short rods with rounded ends, 0.6 to 

 0.8 micron, occurring singlj' or in pairs. 

 Motile. No capsules. Gram-negative. 



Fish gelatin colonies : Circular, sunken , 

 entire, crateriform, granular. 



Fish gelatin stab: Stratiforrn liquefac- 

 tion, growth best at surface. 



Fish agar slant: Abundant, raised, 

 glistening, smooth, opaque, graj% vesicu- 

 lar, viscid growth. 



Fish agar colonies: Circular, con- 

 toured, raised, lobate, granular, fluores- 

 cent green. 



Digests agar; cellulose not attacked. 



Fish broth: Flocculent pellicle, turbid, 

 no sediment, fluorescent green. 



Potato: Abundant, filiform, glistening, 

 smooth, yellowish-brown, butyrous 

 growth. 



Nitrites produced from nitrates. 



No H2S or indole formed. 



Plain milk unchanged; surface growth 

 greenish. 



No acid from rhamnose, sucrose, lac- 

 tose, mannitol, xylose or arabinose. 



Starch is hydrolyzed. 



Aerobic. 



Optimum temperature 20° to 28°C; 

 thermosensitive. 



Source: Isolated from Iridaea cordata. 



Habitat: On marine algae. 



5. Agarbacteriimi mesentericus Angst. 

 (Pugot Sound Biol. Sta. Pub., 7, 1929, 

 49.) 



Short rods with rounded ends, 0.6 by 

 0.8 micron, occurring singly or in pairs. 

 Motile. No capsules. Grp.m-negative. 



Fish gelatin stab: Infundibuliform 

 liquefaction; growth best at top. 



Gelatin colonies: Circular, sunken, 

 irregular, crateriform, granular. 



Fish agar slant: Abundant, filiform, 

 raised, glistening, finely wrinkled when 

 old or dry, opaque, buff, membranous 

 growth. 



Fish agar colonies: Circular, concen- 

 trically ringed, flat, entire, granular, 

 white to buff. 



Digests agar; cellulose not attacked. 



Fish broth: Membranous pellicle, 

 moderate clouding, no sediment. 



Potato: Spreading, raised, glistening, 

 wrinkled, buff to yellowish, membranous 

 growth . 



Does not produce H^S or indole. 



Nitrites not produced from nitrates. 



Plain milk unchanged. 



Acid from mannitol. No acid from 

 xylose, rhamnose, arabinose, glucose or 

 lactose. 



Starch is hydrolyzed. 



Aerobic. 



Optimum temperature 20° to 28°C; 

 thermosensitive . 



