190 IMPORTANT VARIETIES OF FISSION-FUNGI. 



Micr. roseus (Bumm) (Lehm. and Neum.). 



(Plate 11.) 



Synonyms. — Diplococcus roseus (Bumm) Fliigge. 

 See end of section. 



Microscopic Appearance. — Round to irregularly 

 roundish cocci (from 0.6 ^ to 1.0 m), often with rather wide 

 line of division in the cocci (11, xm), at other times more 

 complete cocci lie together in pairs and small groups. 



Motility is lacking. Compare page 192. 



Relation to Oxygen, Nutrient Media, and Temper- 

 ature. — Grows slowly upon all nutrient media, best at 

 room temperature, also at 37°. In shake cultures it grows 

 only near the surface, the deep colonies only very slightly. 

 Pigment is only produced when air is admitted. 



Gelatin Plate. — (a) Natural size : Superficial, irregu- 

 larly roundish, small, rose-red. After a long time they 

 become somewhat larger, evenly elevated, shining. The 

 deep colonies grow very little. After weeks the superficial 

 ones sink gradually into the gelatin. 



(6) Magnified fifty times : Round or roundish colonies, 

 almost even borders, rather finely granular, colored pale 

 to rose-red. The deep appear the same, only they are 

 smaller (11, vn). 



Gelatin Stab. — Stab: Thread-like. After several weeks 

 the gelatin begins to liquefy in a cylindric form. After 

 three months the growth has sunk in about 1 cm. Sur- 

 face appearance: Roundish, sometimes lobed, rose-red 

 growth, which, later, on account of the liquefaction of 

 the gelatin, is almost entirely lost (11, i). 



Agar Plate. — (a) Natural size: Like gelatin. 



(£>) Magnified fifty times. Superficial: Round or round- 

 ish colonies with even or somewhat wavy border, yellowish 

 to red, from the most delicately punctated to coarsely gran- 

 ular (11, v), transparent, more intensely colored toward 

 the center. Deep : Roundish to whetstone-shaped, border 

 smooth or granular, finely to coarsely granular (11, v, vi), 

 opaque, darker than the superficial in color. 



Agar Stab. — Stab canal : Thread-like, later granular 

 (11, in). Surface growth : Roundish, evenly elevated, oily, 

 rose-red, of the consistency of butter (11, iv). 



