368 BACTERIOLOGY 



Agar slant. Colonies, becoming a warty membrane. 



Potato. Growth thin, membranous, becoming orange. 



Milk. Growth as orange-colored flecks, unchanged. Non-pathogenic. 



Habitat. Air. 



1 6. Streptothrix asteroides (Eppinger) 



Cladothrix asteroides Eppinger ; Ziegler's Beitrage, IX. 



Oosfora asteroides Sauvageau-Radais : Ann. Pasteur Inst., VI, 242. 



Morphology. Branched filaments 0.2 fx, thick ; filaments break up into short 

 quadrangular-coccoid segments, which, by the rupture of the wall of the 

 filament at the apex, allow the latter to escape. 



Agar colonies. Round, yellowish white, with a finely granular centre and a 

 pale concentric border. Microscopically, delicate, stellately branched, 

 becoming opaque in centre, with a delicate branched border. 



Glucose agar slant. Firm whitish warts, becoming larger and rugose, ochre- 

 yellow. 



Blood serum. As before. 



Gelatin slant. Growth orange-yellow, rough, rugose. 



Potato. Growth slow, white, becoming brick-red warts ; later pulverent on 

 the surface due to aerial hyphse. 



Bouillon. Clear; on the surface, white disks which fall to the bottom. 



17. Streptothrix carnea Rossi-Doria 



I.e., 1891. 



Morphology. Mycelium branched with aerial hyphae and spores. Colonies 



characterized on all media by their minuteness and rosy color. 

 Habitat. Air (rare). 



18. Streptothrix madurae Vincent 



Ann. Pasteur Inst., 1894. 



Morphology. Branched filaments i-i .5 ju, thick, with aerial hyphae and spores. 



Stained by Gram's method. Optimum temperature 37°. 

 Agar slant. Slow growth, colonies firm, warty, yellowish white, becoming 



reddish — bright red. No growth on blood serum. 

 Bouillon. Growth scanty, as granules. 

 Potato. Growth warty, white, becoming red orange, with whitish aerial 



hyphae. 



