. The actinomycetes. Actinomycetales. N"()Mi;Nci,A'rri{i'; and (;i:m;i{ai, s^s'I'i;ms of ()l tion into hacillary or coccoiil clcmciils: Vmmly I'rodclinonn/cctaccdc I, iV N. 1. Aiiaorol)ic or microarropliilic. usually parasitic, notiacid fast organisms: (\)hnii^ 1 'itio\ . 2. Aerobic, partially acid fast or uoiiacid fast: Proadinoun/CCS Jcuscii. This ^roup is divided into two subgroups: a. Partially acid-fast, uoiiproteolytic, uoudiastatic, utilize paraffin. Usually yellow, i)inl<, or orange to orange red in color. b. Xonacid fast, diast;itic, largcls i)r() teo
. The actinomycetes. Actinomycetales. N"()Mi;Nci,A'rri{i'; and (;i:m;i{ai, s^s'I'i;ms of ()l tion into hacillary or coccoiil clcmciils: Vmmly I'rodclinonn/cctaccdc I, iV N. 1. Aiiaorol)ic or microarropliilic. usually parasitic, notiacid fast organisms: (\)hnii^ 1 'itio\ . 2. Aerobic, partially acid fast or uoiiacid fast: Proadinoun/CCS Jcuscii. This ^roup is divided into two subgroups: a. Partially acid-fast, uoiiproteolytic, uoudiastatic, utilize paraffin. Usually yellow, i)inl<, or orange to orange red in color. b. Xonacid fast, diast;itic, largcls i)r() teolytic. do not utilize parafiin. ^'el low, orange to black in color. II. Substrate mycelium normally remains un- divided: 1. Multiplication l)y conidia foi'ined in chains from aerial liyi)hae: Family Actinomycetaceae Buchanan: Actino- myces Harz. This group is diviiled into five siUigroups: a. Straight sporulating hyphae, mono- podial branching, never producing regular spirals. b. Spore-bearing hyi)hae arranged in clusters. c. Spiral formation in aerial myceliiuii; long, open spirals. d. Spiral formation in aerial mycelium; short, compact spirals. e. Spore-bearing hyphae arranged on mycelium in whorls or tufts. 2. Multiplication by spores formed termi- nally and singly on short conidiophores: Family Micromonosporaceae Krassilni- kov; Micromonospora 0rskov. This group is divided into three subgroups: a. Simple spore-bearing hyphae. b. Branching spore-bearing hyphae. c. Spore-bearing hy])hae in clusters. Thi.^ system, especially the use of the generic name Cohnistrcptothrix for the causa- tive agent of actinomycosis and of Actino- myces for the aerobic forms producing aerial myceliiuii, was subjected to a certain amount of criticism. It was emphasized that although Harz's description of Actinomijces bovis was perhaps ^'ague, there was no ([Uestion con- cerning the nature of the disease caused l)y the organism, and the chances were over- whelmingly in fa\-or of his having actually.
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