Published online by Cambridge University Press: 01 June 2009
A group of species, comprising Bacillus subtilis and related organisms, may be differentiated from other members of the genus Bacillus by (a) morphology and (b) the production of acid and acetylmethylcarbinol from glucose. The group may be divided into three species:
(1) B. subtilis Cohn emend. Prazmowski, the synonyms of which include B. aterrimus, B. globigii, B. mesentericus, B. niger, B. panis, and B. vulgatus.
(2) B. pumilus Gottheil, which resembles strains of (1) that produce a smooth glossy growth. It differs in failing to secrete diastase and in other features, but its separation as a distinct species is still an open question. It is sometimes identified as B. mesentericus.
(3) B. licheniformis (Weigmann) Gibson, the synonyms of which include B. subtilis (as used by Ford), B. globigii and B. mesentericus ruber. This species may be differentiated from (1) and (2) by its cultural characters, slow proteolytic action, vigorous CO2 production and ability to grow anaerobically.
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