GENERAL SYSTEMATIC BACTERIOLOGY 353 



Thirteen species of this genus are listed, included under four sub- 

 genera, Leucothrix Oersted, Ophryothrix Borzi, Thiothrix Winogradsky 

 and Leptotrichiella Trevisan. 



It is of interest to note that the original species named (Leptotrichia 

 huccalis) is no longer included, but removed to the genus Rasmussenia. 



Winslow et al. (Committee Soc. Am. Bact., 1917, p. 555) accept this 

 genus with the following description: 



Thick, long, straight or curved threads, frequently clubbed at one end and 

 tapering to the other. Gram-positive when young. Threads fragment into 

 short, thick rods. Anaerobic or facultative. Non-motile. Filaments sometimes 

 granular; non-branching. No aerial hyphae or conidia. Parasites or facultative 

 parasites. 



The type species is Leptotrichia huccalis (Robin) Trevisan. 



Buchanan (1918, p. 405) states: "Rod shaped or filamentous cells, 

 non-motile, unbranched, without aerial hyphae or conidia: parasites 

 or facultative parasites." 



Bergey et al. (1923, p. 338) follow the Committee, including this as 

 the second genus of the family Actinomycetaceae. 



In spite of Trevisan's disavowal, Leptotrichia huccalis (Robin) 

 Trevisan is the type of the genus. 



Leptotrichieae. A tribal designation used by De Toni and Trevisan 

 (1889, p. 932) with the following description: "Sporae nullae aid saltern 

 huiusque numquam detectae. Filamenta simplicia." 



The following genera are included, Leptotrichia Trevisan, Phragmid- 

 iothri.c Engler and Beggiatoa Trevisan. 



Leptotrichiee. A name given by Trevisan (1889, p. 10) to the second 

 tribe of his suborder Tricogene. The description is "Semplice." Six 

 genera were included, Cladothrix, Leptotrichia, Phragmidiothrix, Beggiatoa, 

 Kurthia and Billetia, 



Leptotrichiella. The fourth subgenus of the genus Leptotrichia 

 according to De Toni and Trevisan (1889, p. 935). The sole descrip- 

 tion is: "Zoobia." The only species is Leptotrichia amphibola Tre- 

 visan, from the stomach of a dog, the Streptomesobacterio of Maggi. 



Leucocystis. A generic name proposed by Schroeter (1883, p. 196) 

 for the species Leucocystis cellaris. The organism was found in slimy 

 masses on the walls of wine cellars. The original description follows: 



Die Hauptmasse des Schleimes wird gebildet durch zahllose Schizomyceten, 

 die verschiedenen Gattungen angehoren. Die haufigste und zwar iiberall mit 

 Regelmiissigkeit vorkommende Form ist ein eigenthumlicher Micrococcus, den 

 ich als Leucocystis cellaris beschreiben will. Er bildet kugelige oder kurz ellip- 



