SUBGROUPS AND GENERA OF ACTINOMYCETALES 405 



The type species is Actinobacillus lignieresi Brumpt, the cause 

 of actinobacillosis in cattle. 



Genus 2. Leptotrichia Trevisan, 1879, p. 138 



Synonyms ; 



Leptothrix Robin, 1847, p. 345 



not Leptothrix Kuetzing, 1843, p. 198 

 Rasmussenia Trevisan, 1889, p. 930 



Rod shaped or filamentous cells, non motile, unbranched, without 

 aerial hyphae or conidia; parasites or facultative parasites. 



The type species is Leptotrichia buccalis (Robin) Trevisan. 

 This genus is commonly termed Leptothrix, but certainly forms 

 as unlike as Leptothrix ochracea and Leptotrichia buccalis do not 

 belong in the same genus. Leptotrichia was created by Trevisan 

 in 1879 with L. buccalis as the only species, but in 1889 he en- 

 larged the genus, removing the mouth forms to the genus, 

 Rasmussenia. 



Genus 3. Actinomyces Harz, 1877, p. 125 



Synonyms : 



Streptothrix Cohn, 1875, p. 186 



not Streptothrix Corda 

 Discomyces Rivolta and Micellone, 1879, p. 145 

 Micromyces Gruber, 1891, p. 648 



not Micromyces Dangeard, 1888, p. 55 

 Nocardia Trevisan (in part) 

 Oospora Sauvageau and Radais, 1892, p. 242 



not Oospora Wallroth, 1833, p. 182 

 Cohnistreptothrix Pinoy, 1911 



Branched filaments, resembling mycelium, breaking up into 

 segments which may function as conidia. Usually parasitic. 

 Clubbed ends conspicuous in lesions. Not producing aerial 

 hyphae or conidia. 



The type species is Actinomyces bovis Harz, the cause of bovine 

 actinomycosis. 



THE JOURNAL OF BACTERIOLOGT, VOL. Ill, NO. 4 



