Chapter II — 31 — Important Types 



In group 5, the spore-bearing branches arise from definite knots, in 

 the form of tufts or whorls, on one plane along the mycelium. These 

 tufts consist of 3 to 10 sporophores and are formed more or less equidistant 

 along the mycelium. This type of sporulation is ordinarily produced 

 only on certain media, usualh' synthetic agar, but not on organic media. 



Tv'pe Species: Streptomyces dims (Rossi-Doria em. Krainsky) 

 Waksman and Henrici. QStreptothrix alha Rossi-Doria; Cladothrix 

 alha Mace; Nocardia alha Chalmers and Christopherson; Cladothrix 

 dichotoma Mace; Streptothrix foersteri Gasperini; Streptothrix 2 and 3 

 Almquist; Actinomyces saprophyticns Gasperini; Oospora doriae Sauva- 

 geau et Radais; Cladothrix liquefaciens Hesse; Cladothrix invidnerahilis 

 Acosta e Grande Rossi; Actinoviyces chromogemis Gasperini; Strepto- 

 thrix nigra Rossi-Doria; Streptothrix gedanensis I Scheele et Petruschky; 

 Streptothrix graminearxim Berestneff; Actinomyces thermophilus (Berest- 

 neff) Miehe; Cladothrix odorifera Rullmann; Actinomyces chromogenes 

 Gasp. P alha Lehmann and Neumann; Oospora sp. Bodin; Oospora 

 alpha Price-Jones; Streptothrix leucea Foulerton; Streptothrix Candida 

 Petruschky; Streptothrix lathridii Petruschky; Streptothrix dassonvillei 

 Brocq-Rousseau; Streptothrix pyogenes Caminiti; Actinomyces alhus 

 Krainsky; Actinomyces sanninii Ciferri; Actinomyces almqnisti Duche; 

 Actinomyces gotigeroti Duche, and numerous others). 



This is one of the most widely distributed and most widely described 

 tN'pes in nature. It produces no soluble pigment and abundant white 

 aerial mycelium. Various strains isolated by different investigators have 

 been variouslv described. The most complete recent study was made by 

 Duche (98) and by Baldacci (20). 



Vegetative hyphae: Branched, l/x in diameter. 



Aerial mycelium: Abundant white, 1.3 X 1.7^1, with abundant spore formation. 



Pigment, soluble: None. 



Aerobic. 



Odor: Characteristic. 



Gelatin: Liquefied, no soluble pigment. 



Bouillon: Flaky growth on bottom with surface pellicle. 



Milk: Peptonized after having become coagulated. Reaction becomes alkaline. 



Carrots and other vegetables: Excellent growth. 



Habitat: Dust, soil, grains, and straw. 



The last edition of Bergey's Manual contains descriptions of 73 spe- 

 cies of Streptoviyces, and an additional large number of incompletely 

 described species. 



Genus IV. Micromonospora Orskov 



(Thermoactinomyces Tsiklinsky). 



Well developed, fine, nonseptated myceHum, 0.3-0.6[jl in diameter. 

 Grow well into the substrate, not forming a true aerial mycelium at any 

 time. Multiply by means of conidia, produced singly at end of special 



