2. Non-chromogenic. a. Abundant growth on potato. aa. No growth on potato. B. Flagellation peritrichous. 1. Gelatin liquefied. 2. Gelatin not liquefied. 3. Agarbacterium mesentericum. 4. Agarbacterium reducans. 5. Agarbacterium amocontactum. 6. Agarbacterium pastinator. II. Non-motile. A. Acid from glucose or mannitol. 1. Acid from glucose but not from mannitol. 7. Agarbacterium uliginosum. 2. Acid from mannitol but not from glucose. 8. Agarbacterium bufo B. No acid from glucose or mannitol. 1. Grow on fish agar slant. a. Cells measure up to 4.0 microns in length. 9. Agarbacterium polysiphoniae. aa. Cells do not measure up to 4.0 microns in length. b. Pellicle produced in broth. 10. Agarbacterium ceramicola. bb. Pellicle not produced in broth. 11. Agarbacterium boreale. 2. Does not grow on fish agar slant. 12. Agarbacterium delesseriae. 1. Agarbacterium aurantiacum Angst, 1929. (Puget Sound Biol. Sta. Pub., 7, 1929, 53.) aur.an.ti'a.cum. L. part. adj. aurans, aurantis overlaying with gold; M.L. noun aiirantium the orange; M.L. adj. aurantiacus orange-colored. Short rods, 0.6 by 0.8 micron, with rounded ends, occurring singly and in pairs. Not encapsulated. Motile. Gram-negative. All media contained a decoction made by boiling or autoclaving fronds of Iridaea, a sea weed, in sea water or in a 3 per cent salt solution. Gelatin colonies: Circular, sunken, en- tire, crateriform, granular; growth is slow. Fish gelatin slant: Abundant, filiform, flat, glistening, smooth, opaque, orange, butyrous growth. Fish gelatin stab: Stratiform liquefaction; growth best at top. Agar colonies: Circular, smooth, flat, erose, granular; growth is slow. Agar slant: Abundant, filiform, flat, glis- tening, smooth, opaque, orange, butyrous growth. Fish agar slant: Abundant, filiform, flat, dull, smooth, opaque, orange, butyrous growth. Meat agar slant: Abundant, filiform, raised, dull, smooth to wrinkled, opaque, orange, butyrous growth. Broth: Turbid, no sediment; membranous pellicle. Plain milk unchanged; surface growth orange. Potato: Abundant, filiform, flat, dull, smooth, orange, butyrous growth; the po- tato becomes grayed. Indole not produced. Hydrogen sulfide not produced. Slight acid from lactose and mannitol. No acid from glucose, sucrose, xylose, rham- nose or arabinose. Starch not hydrolyzed. Agar digested; cellulose not attacked. Nitrites not produced from nitrates. Aerobic.
