518 GENERAL SYSTEMATIC BACTERIOLOGY 



Migula (1900, II, pp. 322-588) has apportioned some ten species 

 between the genera Bacillus and Bacterium. The genus name is 

 rejected by E. F. Smith (1905, p. 174). 



Lehmann and Neumann (1907, p. 396) make the following state- 

 ment : 



Das Genus Tyrothrix Duclaux fallt mit Bacillus zusammen, es bezeichnet 

 urspriinglich aus Milch und Ivase stammende, sporentragende, langere Faden 

 bildende Arten. Zwei spezies sind untenbeschreiben. Die Tyrothrix arten sind 

 neuerdings von Niede (C. B. L. XII. 344) mit einem von ihm genau beschriebenen 

 Bacillus parvus fiir synonym erachtet worden. 



The lack of adequacy in the original description make determination 

 of the nomenclatural status of this genus difficult. It is probably a 

 synonym of Bacillus Cohn. The type species may be designated as 

 Tyrothrix tenuis. 



Ulvina. A generic name applied as Ulvina aceti to mother of vinegar 

 by Kuetzing in the 11th decade of his Algae aquae dulcis (1837). In 

 the same year (1837, p. 26) the organism is mentioned by name and 

 later (p. 30) illustrated. 



Later (1843, p. 149) the following generic description is given: 

 "Stratum compactum lubricum ex granulis minutissimis compositum." 

 Four species are listed, U. myxophila from sour quince slime, U. 

 rubi-idaei from fermenting raspberry juice, U. aceti from mother of 

 vinegar, and U. sambuci from the aqua sambuci flor, of the apothecary. 



Naegeh (1849, p. 5) mentions Ulvina as a genus to be included 

 among the fungi and excluded from the unicellular algae. 



In his Species Algarum (1849, p. 147) the generic description is 

 "Globuli gonimici minutissimi in stratum compactum cohaerens 

 fluitans coaliti." The same four species previously described are 

 listed. Ulvina aceti is again mentioned in 1852, (p. 269). 



Rabenhorst (1864, p. 8) in a footnote under Subfamiha II, Lepto- 

 thricheae says: 



Fungorum genera Leptothricheis et Oscillarieis quasi affinia : 



a. Cryptococcus. Cellulae sphaericae, in stratum mucosum aggregatae. 



b. Ulvina: Cellulae minutissimae, in stratum membranaceum coalitae. 



According to De Toni and Trevisan (1889, p. 1021) {g.v) the Ulvina 

 aceti was termed Mycoderma aceti by Pasteur (1868, p. 106), Bacterium 

 aceti by Lanzi (1876, p. 257), Torula aceti by Saccardo (1878, p. 315), 

 Bacillus aceti by Schroeter (1886, p. 161). 



