Memoirs Nat. Acad. Sci., 7, 1895, 436; Chester, Man. Determ. Bact., 1901, 323.)
in.cog′ni.ta. L. adj. incognitus not examined, unknown.
Short rods, with rounded ends, occurring singly, in pairs and in chains. Motile, possessing a polar flagellum. Gram-negative.
Gelatin colonies: Thin, translucent, slightly granular, becoming greenish. Margin undulate. The medium assumes a blue-green fluorescence.
Gelatin stab: No liquefaction.
Agar slant: Thin, moist, translucent. Agar becomes greenish.
Broth: Turbid, becoming greenish. Pellicle and whitish sediment form.
Litmus milk: Slightly acid in a month. Litmus slowly reduced.
Potato: Moist, glistening, spreading, brown.
Indole is produced (trace).
Aerobic, facultative.
No growth at 35° to 36° C.
Comment: Wright (op. cit., 1895, 441) described an organism that is very similar to this species except that it may produce a faint brownish green coloration in a gelatin stab; Wright named the organism Bacillus nexibilis (Bacterium nexibilis Chester, Ann. Rept. Del. Col. Agr. Exp. Sta., 9, 1897, 74; Pseudomonas nexibilis Chester, op. cit., 1901, 309).
Source: Isolated from water from the Schuylkill River.
Habitat: Water.
25. Pseudomonas rugosa (Wright, 1895) Chester, 1901. (Bacillus rugosus Wright, Memoirs Nat. Acad. Sci., 7, 1895, 438; Chester, Man. Determ. Bact., 1901, 323.)
ru.go′sa. L. adj. rugosus full of wrinkles.
Small rods, with rounded ends, occurring singly, in pairs and in chains. Motile, possessing 1 to 4 polar flagella. Gram-negative.
Gelatin colonies: Grayish, translucent, slightly raised, irregular, sinuous, radiately erose to entire.
Gelatin stab: Dense grayish green, limited, wrinkled, reticulate surface growth. No liquefaction. Medium becomes green.
Agar slant: Grayish white, limited, slightly wrinkled, translucent. Agar becomes green.
Broth: Turbid, with thin whitish pellicle and sediment.
Litmus milk: Acid, coagulated, partly reduced.
Potato: Moist, glistening, brown, spreading.
Indole is produced (trace).
Aerobic.
Optimum temperature, 30° C. Does not grow at 35° C.
Source: From water from the Schuylkill River.
Habitat: Water.
26. Pseudomonas mildenbergii Bergey et al., 1930. (Der Blaubacillus, Mildenberg, Cent. f. Bakt., II Abt., 56, 1922, 309; Bergey et al., Manual, 3rd ed., 1930, 172.)
mil.den.ber′gi.i. Mildenberg, a patronymic; M.L. gen. noun mildenbergii of Mildenberg.
Rods, 0.3 to 0.5 by 1.0 to 3.5 microns, with rounded ends, occurring singly. Motile, possessing polar flagella. Gram-negative.
Gelatin colonies: Circular, lobed, smooth, glistening, slightly raised, steel-blue, entire.
Gelatin stab: No liquefaction.
Agar colonies: Small, circular, yellowish or reddish yellow, entire, becoming lobed, grayish green, iridescent. The medium becomes dirty grayish green.
Agar slant: Smooth, spreading, slimy, glistening, grayish green to dark green, fluorescent.
Broth: Turbid green, iridescent to opalescent with slimy sediment.
Litmus milk: Not coagulated, blue ring.
Potato: Slimy, glistening, spreading, steel blue.
Indole not produced.
Nitrites not produced from nitrates.
Aerobic, facultative.
Optimum temperature, 25° C.
Source: Isolated from air.
27. Pseudomonas convexa Chester, 1901. (Bacillus fluorescens convexus Wright, Memoirs Nat. Acad. Sci., 7, 1895, 438; Chester, Man. Determ. Bact., 1901, 325.)
con.vex′a. L. adj. convexus vaulted, convex.
Short, thick rods, with rounded ends.
