46 GENERAL SYSTEMATIC BACTERIOLOGY 



B. Embedded in slime : 



1. Single cells Hyalococcus 



2. Packets Sarcina 



3. Chains Leuconostoc 



II. Forming rods, not long filaments: 



A. Not embedded in slime : 



1. Small elliptical cells Bacterium 



2. Small rods with endogenous spores.. Bacillus 



3. Spiral: 



a. Stiff or rigid Spirillum 



b. Long and flexuous Spirochaete 



B. Embedded in slime : 



1. Cells bent or spiral Myconostoc 



2, Straight rods Cystobacter 



III, Forming long filaments, usually with a sheath: 



A. Unbranched: 



1. Non-motile and without inner spore formation. 



Leptothrix 



2. Non-motile with sheath and inner spore formation. 



Crenothrix 



3. Motile Beggiatoa 



B. Branched: 



1. Branches not swollen at tips: 



a. Free Cladothrix 



b. In slimy sheath Sphaerotilus 



2. Branches swollen at tips Actinomyces 



Sternberg (1892) used a comparatively simple classification, merging 

 genera in several cases. His conception of generic names however is 

 in some cases inconsistent. The following key probably fairly indi- 

 cates the principal points of difference as recognized by this author: 



Sternberg's Classification of Bacteria (1892) 



A. Cells spherical. 



I. Cells not embedded in gelatinous masses, 

 a. Cell division in one direction. 



1. Cells irregularly grouped Micrococcus 



2. Cells in pairs Diplococcus 



3. Cells in chains Streptococcus 



h. Cell division in two directions, forming tetrads. 



Merismopedia 

 c. Cell division in three planes, forming regular packets. 



Sarcina 

 II. Cells embedded in gelatin. 



a. Cells separate in globular or lobulate zoogloeal masses. 



Ascococcus 

 h. Cells solitary or in chains, with a thick gelatinous envelop. 



Leuconostoc 



