192 IMPORTANT VARIETIES OF FISSION-FUNGI. 



Micr. roseus (Lehm. and Neum.). 



(a) TyprVas. — Agar streak, rose to carmine, more rarely whitish- 

 red. Streak upon the subtilis-potato (compare above), deep carmine- 

 red. Milk unchanged, with beautiful rose-red precipitate. Here be- 

 long the Micr. agilis of Zimmermann from Berlin and three of our 

 air-cocci. 



(/?) Roseo-fulvus. — Agar streak, reddish-yellow to vermilion-red. 

 Streak upon subtilis-potato, orange-red. Milk not coagulated, with 

 yellowish-red cream layer and yellowish-red precipitate. 



Here belong, according to our investigations, Micr. tetragenus ruber 

 Krai, Micr. roseus A. Fischer, Staph, roseus Tavel, and one of our air- 

 cocci ; perhaps also the Micr. f ulvus Cohn, which is very insufficiently 

 described. 



But we must go a step further still. The Sarcina rosea 

 Schroter (compare p. 162) also stands in close relation 

 to the described varieties. The Sara rosea, obtained from 

 Krai (it belongs to the variety roseo-fulva), forms beautiful 

 sarcina balls upon fluid but not upon solid nutrient media, 

 but was otherwise not to be differentiated (compare p. 

 163). After we had kept our ten red cocci upon hay 

 decoction for a month, one of our red forms (from air) 

 produced typical sarcina packets, while the others were 

 only brought to produce tetrads. 



Thus also, the Sarcina rosea may be thought of as the 

 forma sarcinica of the Micrococcus roseus.- The Micr. 

 corallioides Cantani (C. B. xxiii, 309) is also very closely 

 related, according to the description of the author, but the 

 name ' ' corallioides ' ' (rectius ' ' corallioides " ) is already 

 given to another organism (p. 175). 



Our point of view demands a special explanation regard- 

 ing the interesting organism found by Ali-Cohen and 

 Zimmermann in water. 



Micr. agilis Ali-Cohen (C. B. vi, 33). 



We have not seen spontaneous motion nor a flagdlum, 

 either in the culture from Berlin or in the one from Krai, 

 in spite of all our pains, as growing upon slant of 5% 

 milk-sugar agar, upon sugar hay-decoction, bouillon, etc., 

 employment of higher and lower temperatures, young 

 and old cultures, etc. Neither culture is to be differ- 

 entiated from our Micr. roseus. 



