FAMILY III. STREPTOMYCETACEAE 753 



A. Limited proteolytic action in gelatin, milk, coagulated egg-albumin or fibrin. 



1. Vegetative growth white. 



a'. No soluble pigment in organic media. 



141. Streptomyces listen. 



a^. Soluble pigment in organic media brown to brown-red. 



142. Streptomyces galtieri. 



2. Vegetative growth cream-colored; aerial mycelium scant, white. 



143. Streptomyces upcotlii. 



3. Growth very limited on various media, e.xcept on potato plug; no liquefaction 

 of gelatin. 



144. Streptomyces hortonensis. 



B. Strong proteol^^tic action in gelatin and milk. 



1. Growth on potato plug moist, membranous. 



a^ Pigment deep brown. 



145. Streptomyces beddardii. 

 a^. Pigment faint brown. 



146. Streptomyces kimberi. 



2. Growth on potato plug abiuidant, becoming black; aerial mycelium white-gray; 

 plug discolored. 



147. Streptomyces somaliensis. 



3. Growth on some media pink. 



148. Streptomyces panjae. 



4. Aerial mj-celium on most media profuse, white; spiral formation. 



149. Streptomyces willmorei. 

 V. No aerial mycelium. 



150. Sterile (non-conidia-forming) species. 



1. Streptomyces albus (Rossi-Doria, chains on lateral branches of the aeria 



1891, emend. Krainsky, 1914) Waksman and hyphae. 



Henrici, 1943. {Streptotrix (sic) alba Rossi- Gelatin: Rapid liquefaction. Gray colo- 



Doria, Ann. d'Ist. d'Ig. sper. d. Univ. di nies. No soluble pigment. 



Roma, 1, 1891, 399; Actinomyces albus Agar: No aerial mycelium, but a chalky 



Krainsky, Cent. f. Bakt., II Abt., 41, 1914, white deposit forms on old colonies. 



662; Waksman and Henrici, Jour. Bact., 46, Ca-malate agar: Colonies of medium size; 



1943, 339.) the center only is covered with a white 



al'bus. L. adj. albus white. aerial mycelium. 



The description of this species by Rossi- Starch agar: White aerial mycelium cover- 



Doria is incomplete. The characters given ing the whole surface. 



below are taken from Krainsky (op. cit., Glucose agar: Gray aerial mycelium be- 



1914, 662) with some supplementary infor- coming brownish. 



mation from later authors. Other descrip- Broth: Flaky growth on bottom with 



tions which may vary from this in certain ^"'^''^^ P^"'"^^ ^" °^^ cultures. White aerial 



details are given bj^ Waksman and Curtis 



mycelium. 



(Soil Sci., /, 1916, 117), Bergey et al. (Man- ,. ^'^^J Rapidly peptonized after coagula- 



ual, 1st ed., 1923, 367), Duch6 (Les actino- ^^^^^ ^"T ',' T"'" Z ■ ^^''"^^^■ 



mycesdugroupe albus, Paris, 1934, 257) and ^^eHum ' """' ' ''" 



Baldacci (Mycopathologia, 2, 1940, 156). Totlt^' White aerial mycelium. Growth 



Vegetative growth: Hyphae branched, 1 

 micron in diameter. 



folded, cream-colored. 

 Carrots and other vegetables: E.xcellent 

 Aerial mycelium: Abundant, white. growth (Duch6). 

 Hyphae 1.3 to 1.7 microns in diameter with No hydrolysis of starch in some cultures; 



ellipsoidal spores (1 micron long) in coiled rapid hydrolysis in others. 



