. The actinomycetes. Actinomycetales. Figure 25. S. rubrireticuli, a verticil-forming streptomyces (Reproduced from: Shinobu, R. Mem. Osaka Univ. No. 4B: 74, 1955). genera, Corynebaderium and Mycobacterium; Actinomycetaceae, with only one genus Acti- nomyces. Kluyver and van Xiel suggested the removal of the family Mycobacteriaceae from the Actinomycetales altogether. Langeron suggested the following system of classification of actinomycetes: I. Euactinomyces, aerobes. II. Cohnistreptothrix, anaerobes, grow poorly on artificial Figure 26. Anitclla type verticil-forming strep- tomyces (
. The actinomycetes. Actinomycetales. Figure 25. S. rubrireticuli, a verticil-forming streptomyces (Reproduced from: Shinobu, R. Mem. Osaka Univ. No. 4B: 74, 1955). genera, Corynebaderium and Mycobacterium; Actinomycetaceae, with only one genus Acti- nomyces. Kluyver and van Xiel suggested the removal of the family Mycobacteriaceae from the Actinomycetales altogether. Langeron suggested the following system of classification of actinomycetes: I. Euactinomyces, aerobes. II. Cohnistreptothrix, anaerobes, grow poorly on artificial Figure 26. Anitclla type verticil-forming strep- tomyces (Rei)rodvu'ed from: Shinobu, R. Mem. Osaka Univ. No. 4B: 75, 1955). Recent Systems of Classijication 0rskov, in 1923, divided the actinomy- cetes into three genera: 1. Cohnistreptothrix, nonseptate mycelium, forming readily sporulating aerial hyphae. 2. Actinomyces, mycelium septated: a. Cultures forming aerial mycelium. b. Cultures not forming any aerial mycelium. 3. Micromonospora, with single spores borne at the ends of branches. Jensen (1931) modified the above system by retaining the last genus unchanged, and by designating the first genus as Actinomyces and the second as Proactinomyces, as shown here: A. No spores are formed. Family Proactinomycetaceae I. No mycelium is formed. a. Acid-fast organisms. Genus Mycobacterium b. Nonacid-fast organisms. Genus Corynebacterium II. Mycelium is formed. Genus Proactinomyces B. Spores are formed. Family .4ctinomycetaceae I. Spores in aerial mycelium. Genus Actinomyces II. Spores terminally on branches of vegetative mycelium Genus Micromonospora Lignieres (1922) divided the actinomy- cetes into three groups: 1. Actinomyces. Aerobes; mycelial hyphae long, not Ijreaking up into rods. 2. Brevistreptothrix. Anaerobes; mycelial hyphae short, l)reak up into long rods. 3. Actinobacillus. No mycelium. Cells rod- shaped. I'untoni and Leonardi (1935) divided the actinomycetes into three genera: 1. Actinomyces Ilarz, a,er()l)ic, producing aerial
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