GENERAL SYSTEMATIC BACTERIOLOGY 95 



Key to the Tribe Bacteroideae 

 One genus only: Bacteroides. 



Key to the Tribe Bacilleae 

 One genus only: Bacillus. 



Key to the Genera of the Family Spirillaceae 



A. Non-motile, comma-shaped, or spirally curved filaments, rigid, without 



flagella Genus 1. Spirosoma Migula, 1900 



B. Motile, short, slightly curved, rigid, comma-like, sometimes in chains, with 



one, rarely more, flagella at one end, seldom at both ends. 



Genus 2. Vibrio O. F. Miiller, 1773, emendavit Loeffler 



C. Motile, long, spirally curved, usually with a bunch of polar flagella composed 



of long and short forms. 



Genus 3. Spirillum Ehrenberg. 1838 emendavit LoeflHer 



Key to the Family Mycobacteriaceae 

 One genus only: Mycobacterium. 



Many of the Hyphomycetes are included under the class Fungi-Imper- 

 fecti and under the sub-class Hyphales. 



Key to the Orders of Hyphornycetes 



A. Mycelium composed of fine bacilliform hyphae in which the nuclei are usually 



indistinct Order 1. Microsiphonales. Vuillemin, 1912 



B. Mycelium not so composed: 



1. Reproduction by thallospores. 



Order 2. Thallosporales. Vuillemin, 1910 



2. Reproduction bj"^ hemispores. 



Order 3. Hemisporales. Vuillemin, 1910 



3. Reproduction by conidia. .Order 4. Conidiosporales. Vuillemin, 1910 



Key to the Families of the Order Microsiphonales 



A. Nocardiaceae Castellani and Chalmers, 1918. Synonyms. — Actinoynycetes 



Lachner-Sandoval, 1898; Trichomijcetes Petrusky, 1903. 

 Definition. — Microsiphonales with a mycelium. 

 Type Genus. — Nocardia Toni and Trevisan, 1889. 



B. Mycobacteriaceae Miehe, 1909. Definition. — Microsiphonales without a 



mycelium. 

 Genus 1. — Mycobacterium Lehmann and Neumann, with the diphtheria 



bacillus as a type. 

 Genus 2. — Corynebacterium Lehmann and Neumann, with the tubercle bacillus 



as a type. 



Key to the Family Nocardiaceae 



A. Grows aerobically, easy of cultivation, and producing arthrospores (Fig. 549). 



Genus 1. Nocardia Toni and Trevisan, 1889 



