250 GENERAL SYSTEMATIC BACTERIOLOGY 



Cocci globosi, divisionis tempore ovoidei, in muco matricali nidulantes, singuU 

 V. 2-4 cystidibus specialibus gelatinosis, crassiusculis, persistentibus involuti. 

 Cystides in acervos numerosos conglobatos, intus solidos, dense et inordinate 

 aggregati. Cystides universales nuUae. Coccorum divisio in unam directionem. 

 Sporae ignotae. 



The genus is included in the subtribe, Gaffkyeae, of the tribe Asco- 

 cocceae of the subfamily Coccogenae. Two species are described Chlamy- 

 datomus Beigelii (Kiich. Rabenhorst) Trevisan (Synonyms, Pleuro- 

 coccus Beigelii Kiichenmeister and Rabenhorst 1867. Sderotium 

 Beigelianum, Hallier 1868, Zoogloea Beigeliana Eberth, 1873, Hyalo- 

 coccus Beigelii Schroeter (1886)) and Chlamydatomus cellaris (Hansg.) 

 Trevisan (Synonym, Hyalococcus cellaris, Hansgirg (1880)). 



Chlamydatomus Beigelii is the type (monotypy). It is now not re- 

 garded as a bacterium at all, but as a fungus, a member of the genus 

 Trichosporum. Castellani and Chalmers (1919, p. 1103) recognize 

 Trichosporum beigelii Vuillemin 1901 as the cause of piedra, in nodo- 

 sities on the hairs of the moustache. 



It would seem that VuUlemin was in error in substituting the new 

 generic name Trichosporum for the older generic name Chlamydatomus. 



Chlamydobacteriaceae. A family name proposed by Migula (1894, 

 p. 237) to include those genera of bacteria which are characterized by 

 the possession of firm membrane or sheath surrounding the filaments. 

 The description is as foUows: 



Familie Chlamydohacteriaceae nov. Fam. Formen von sehr verschiedener 

 Entwickelungsstufe, aber alle ausgezeichnet durch eine feste Hiille oder Scheide, 

 welche die zu verzweigten oder unverzweigten Fiiden vereinigten Zellen umgiebt. 



The filaments may be branched or unbranched. The family as 

 first described contained the following genera : Streptothrix Cohn 

 emend., Phragmidiothrix Engler, Crenothrix Cohn, Cladothrix Cohn, 

 and Thiothrix Winogr. This family name was used by Chester 

 (1897, p. 64). In the second volume of his System, Migula (1900, 

 p. 1030) gives the following diagnosis of the family: 



Zellen cylindrisch zu Faden angeordnet, die von einer Scheide umgeben sind. 

 Vermehrung erfolgt durch bewegliche oder unbewegliche Conidien, welche direkt 

 aus den vegetativen Zellen hervorgehen und, ohne eine Ruheperiode durchzu- 

 machen, zu neuen Faden auswachsen. 



The family is used without material alteration in definition by 

 Chester (1901, p. 369), Schmidt and Weis (1892, p. 92), A. J. Smith 

 (1902, p. 272), Kendall (1902, p. 484), Migula (1904, p. 145), E. F. 



