CHAPTER IX. 



SYSTEMATIC AND DESCRIPTIVE. 



THE Schizomycetes, Spaltpilze or Fission-fungi have 

 already been described as divisible, according to 

 Zopf, into four groups ; Coccacea, Bacteriacecz, Lep- 

 totrichece, and Cladotrichecz. They comprise the 

 following genera and species : 



GROUP I. COCCACE^:. 

 Genus I. Streptococcus (Chain-cocci). Division in one 



direction only. Individual cocci remain united 



together to form chains. 

 Genus II. Merismopedia (Plate-cocci). Division in 



two directions, forming lamellae or plates. 

 Genus III. Sarcina (Packet-cocci). Division in three 



directions, forming colonies in cubes or packets. 



Genus IV. Micrococcus (Mass-cocci). Division in one 

 direction, cocci after division remain aggregated 

 in irregular heaps or botryoidal masses. 



Genus V. Ascococcus (Pellicle-cocci). Like micro- 

 coccus, but the cocci grow in gelatinous pellicles. 



Genus I. Streptococcus (Zopf). 



Streptococcus pyogenes, Rosenbach (Chain 

 micrococci in pus : Coccus of Pycemia). Cocci, singly 



