c616 



NON-PATHOGENIC MICROCOCCI. 



or in packets containing eight or more elements, as a result of division in 

 three directions. The cells are smaller than those of Sarcina lutea. 



Biological Characters. An aerobic, liquefying, chromogenic sarcina. 

 Grows in the usual culture media at the room temperature. Upon gelatin 

 plates forms small, spherical, granular colonies of an orange-yellow color. 

 In gelatin stick cultures liquefaction occurs slowly along the line of inocula- 

 tion, and in old cultures a yellow deposit is seen at the bottom of the trans- 

 parent, liquefied gelatin. Upon the surface of agar an abundant, shining, 

 golden-yellow layer is formed. Upon potato development is scanty and 

 slow, being limited to the line of inoculation. 



227. SARCINA LUTEA (Schroter). 



Found in the air. 



Morphology. Micrococci, 1 // or 

 more in diameter, associated in pairs, in 

 groups of four, or in packets containing 

 eight or more elements. 



Biological Characters. An aero- 

 bic, liquefying, chromogenic sarcina. 

 Grows in the usual culture media at 

 the room temperature. Upon gelatin 

 plates small, spherical, yellow colonies 

 are slowly developed. In gelatin stick 

 cultures development occurs only on 

 the surface in the form of a coarsely 

 granular, yellow layer of moderate di- 

 mensions; liquefaction of the gelatin 

 occurs in old cultures and progresses 

 slowly. Upon the surface of agar a 

 rather thick, canary-yellow layer is 

 quickly developed. Upon potato a sul- 

 phur-yellow streak is slowly developed 

 along the line of inoculation. 



FIG. 208. Sarcina lutea, from an agar 

 culture. X 1,000. From a photomicro- 

 graph. (Frankel and Pfeiffer.) 



228. SARCINA FLAVA (De Bary). 



Found by Lindner in beer. 



Morphology. Small micrococci in packets of sixteen to thirty-two ele- 

 ments, which may be associated in irregular masses or united in larger 

 packets of cubical form. 



Biological Characters. An aerobic, liquefying, chromogenic sarcina. 

 Grows in the usual culture media at the room temperature. Upon gelatin 

 plates spherical, yellow colonies are developed, and liquefaction of the gel- 

 atin around them commences in about four days. Upon the surface of agar 

 forms a yellow layer. Upon potato the growth is scanty and limited to the 

 impfstrich, yellow in color. 



229. SARCINA ROSE A (Schroter). 



Found in the air. 



Morphology. Large cocci in cubical packets with rounded corners, and 

 about eight p thick. 



Biological Characters. An. aerobic, liquefying, chromogenic sarcina. 

 Grows in the usual culture media at the room temperature. In gelatin 

 stick cultures liquefaction occurs rapidly, and old cultures acquire a red 

 color, which by the addition of sulphuric acid is changed to bluish-green. 

 Uponograr growth is slow, and small, cartilaginous-looking masses are de- 

 veloped. Upon potato an abundant, intensely red layer is quickly de- 

 veloped. In bouillon development is rapid and a red sediment is deposited. 



