706 MEDICAL MYCOLOGY 



Cladothrix Cohn, Beitr. Biol. Pflanzen 2: 185, 1875, non DeCandolle 1849. 



Discomyces Rivolta, Clin. Vet. Milano 1: 208, 1878. 



Malhranchea, Saccardo & Penzig, Michelia 2: 639, 1882. 



Nocardia Trevisan, I genera e le specie delle Batteriacee. 9, 1889. 



Micromyces Gruber, Centralbl. Bakt. 10: 648, 1891, not Dangeard, 1888. 



Oospora Sauvageau & Radais, Ann. Inst. Pasteur 6: 242-273, 1892, non 

 Wallroth, 1833. 



Cohnistreptothrix Pinoy, Bull. Inst. Pasteur 11: 929, 1913. 



The type species is Acti7wmyces hovis Harz. 



Mycelium usually branched, very slender, usually less than 1/a in diameter, 

 seldom more than 1.5/a, probably septate, but the septa are often very difficult 

 to observe; conidia are borne on specialized conidiophores, usually in coiled 

 chains which are very fragile and break up so easily that they are difficult 

 to observe. Primarily soil saprophytes; a few species are parasitic on ani- 

 mals, and still fewer on plants. 



Key to Species 



Cultures unknown. 



Seen in juxta-articular nodules. A. Carougea/ui. 



Seen in calcareous deposits in muscles of swine. A. musculorum. 



Cultivated. 



Obligate anaerobes. 



Bacillary forms only seen in cultures. 



Growth on gelatin which is liquefied; from dacryocystitis. 



A. Silherschmidti. 

 Culture difficult, no liquefaction of gelatin; ulcers on muzzles of rabbits. 



A. cuniculi. 

 Hyphae seen in cultures. 



No growth on gelatin or potato, but good on ascitic agar. 



Isolated from pus. A. Neschcsadimenhi. 



Isolated from axillary and pubic hair. A. tenuis. 



Good growth on gelatin. 



Gelatin liquefied; isolated from blood in generalized infection. 



A. Thjoettae. 

 Gelatin not liquefied; calf diphtheria. A. necroplwrus. 



Facultative aerobes, growth better under partial anaerobic conditions. 

 Growth on usual media, clavate bodies present. 



Not pathogenic for laboratory animals, from concretions in lacrimal canal, 

 colonies grayish. 

 Growth on potato, starch digested. A. Foersteri. 



No growth on potato, starch not digested. A. discofoliatus. 



Pathogenic for laboratory animals. 



Colony yellowish; human actinomycosis. A. Israeli. 



Colony white; subcutaneous and intramuscular nodules. 



A. Thihiergei. 

 Growth absent on usual media, gram-negative. 



Colony translucent on ascitic agar; isolated fiom pubic and axillary hair. 



A. tenuis. 



