FAMILY PASTEURIACEAE 



837 



Appendix: Henrici and Johnson {loc. 

 cit., S4) figure but do not name four addi- 

 tional types of thesa organisms which 

 thej^ regard as additional species belong- 

 ing to this genus. 



Stanier and Van Xiel (Jour. Bact., 4^, 

 1941, 454) regard the following as be- 

 longing to this group: 



Hyphomicrobium rulgare Stutzer and 

 Hartleb. (Saltpeterpilz, Stutzer and 

 Hartleb, Cent. f. Bakt., II Abt., 

 3, 1897, 621; Stutzer and Hart- 

 leb, Untersuchungen tiber die bei der 

 Bildung von Saltpeter beobachteten 

 Mikroorganismen, I Abt. Mittheil. land- 

 wirtsch. Inst. Univ. Breslau, 1898, abst. 

 in Cent. f. Bakt., II Abt., 5, 1899, 678.) 



From tap water and soil. The position 

 of this organism in relation to other 

 Schizomycetes is very uncertain. It is 

 regarded by Boltjes (Arch. f. Mikrobiol., 

 7, 1936, 188) as an organism which may 

 be transitional between Schizomycetes 

 and Phycomyceles. The cells possess 

 structures which appear to be polar fla- 

 gella; but with dark field illumination 

 show an attached thread of ultramicro- 

 scopic size. Reproduction by cell divi- 

 sion was not observed. Possibly this 

 maj' be by budding from the attached 

 thread. Associated with Nitrohacter 

 spp. This is the type species of the 

 genus Hyphomicrobium Stutzer and 

 Hartleb. 



