GENERAL SYSTEMATIC BACTERIOLOGY 513 



Filament non-motile, segmented, a definite differentiation into base and tip, 

 attached, usually filled with sulphur granules. The threads produce rod shaped 

 conidia at their ends. These conidia are self motile by means of a slow creeping 

 motion, attach themselves and develop into new threads. The habitat is hot 

 sulphur springs. 



The type species is Thiothrix nivea (Rabenhorst) Winogradsky. 



Bergey et al. (1923, p. 408) followed Buchanan. 



Thiotrix. A variant spelling of Thiothrix used by Schmidt and 

 Weis (1902, p. 92). It is spelled thus in a key. Probably a misprint, 

 as Thiothrix is used later in the text. 



Tilletia. A generic name given by Tulasne (1847) to a group of the 

 smut fungi. According to Trevisan (1879, p. 60) several bacteria 

 were incorrectly placed in the genus by HaUier (1869) under the names 

 of Tilletia scarlatinosa and Tilletia diphtherica. 



Tissierillus. A name proposed by Heller (1922, p. 27) for a genus 

 of Putrificoideae with the description: 



Putrificoideae that attack sugars and clot milk. Slender Gram-negative or 

 Gram-positive rods with oval terminal spores. Colonies in deep agar have radiate 

 periphery and opaque center. Frequently intestinal saprophytes. 



Type species T. paraputrificus (Bacillus paraputrificus defined by Bienstock) 

 as described bj^ Mcintosh under the name BacilUs putrificus. Ferments glucose, 

 maltose, lactose, sucrose and starch. 



Treponema. A generic name proposed by Schaudinn (1905, p. 

 1728) for the species Treponema pallida, the causal organism of syphilis. 

 This organism was first named Spirochaete pallidum by Schaudinn and 

 Hoffmann (1905), later the generic name Spironema (q.v.) was proposed 

 by VuiUemin (1905). Schaudinn noted that Spironema was pre- 

 occupied, and proposed Treponema. A short time later Microspiro- 

 nema was proposed by Stiles and Pfender (1905). Blanchard (1906, 

 p. 4) gives the following generic diagnosis: 



Corps spirale, non aplati, k section cylindrique, effile aux extremites. Un 

 flagelle a chaque extremite; pas de membrane ondulante. Multiplication par 

 division longitudinale, le stade initial pouvant etre marque par la duplicite du 

 flagelle k I'une des extremities. Une seule esp^ce certaine: Tr. pallidum (Schau- 

 dinn (1905). 



This generic name was also used by Swellengrebel (1907, p. 582). 

 Dobell (1910, p. 536) extended the definition to include all the spiro- 

 chetes parasitic in animals. Doflein (1911), treats Treponema as a 

 subgenus under Spirochaeta. Gonder (1914, p. 687) gives the following 

 description: 



