Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Bacillaceae, Genus Bacillus, Bacillus pseudomycoides Nakamura 1998.
Phenotypically is very closed to other members of the Bacillus cereus group: Bacillus anthracis, Bacillus cereus, Bacillus mycoides,
Bacillus thuringiensis and Bacillus weihenstephanensis. Genetic evidence supports the recognition of members of the Bacillus cereus
group as one species, but practical considerations (virulence characters) argue
against such a move. Bacillus pseudomycoides can only be separated from Bacillus
mycoides by DNA relatedness and some differences in fatty acid composition.
Gram positive, 1.0 x 3.0-5.0 µm, occurring singly and in short chains. Nonmotile. Cells
grown on glucose agar produce large amounts of storage material, giving a vacuolate
or foamy appearance. Produce paracentral/subterminal, ellipsoidal endospores
(0.5-0.7 x 0.5-1.2 µm) in unswollen sporangia.
Colonies are white to cream, opaque, and usually rhizoid. Facultatively anaerobic.
Growth temperature 15-40 ºC (optimum 28 ºC); pH 5.7-7. Can grow in 7% NaCl. NaCl,
alantoin or urate are not required for growth.
Isolated from soil. Grow in the presence of lysozyme.
- N.A. Logan and P. De Vos, 2009. Genus I. Bacillus Cohn 1872. In: (Eds.) P.D. Vos, G. Garrity, D. Jones, N.R. Krieg, W. Ludwig, F.A.
Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3: The Firmicutes, Springer, 21-127.
- L.K. Nakamura, 1998. Bacillus pseudomycoides sp. nov. IJSB 48, 1031-1035.
Positive results for degradation of tyrosine, egg yolk reaction, catalase, lecithinase, nitrate reduction, hydrolysis of casein, hydrolysis
of starch, Voges-Proskauer reaction & acid producion from D-glucose.
Negative results for the production of oxidase, indole production & H2S production.
Variable results for citrate utilization.
(c) Costin Stoica