1GO IMPORTANT VARIETIES OF FISSION-FUNGI. 



Sarcina alba (Zimmermann). 



If one imagines the very feebly liquefying forms of Sarc. flava with- 

 out formation of pigment, then one obtains the Sarc. alba likewise with 

 variable liquefaction. The growths on the various nutrient media are 

 white to grayish-white, usually very delicate. Microscopically this 

 variety is not distinguishable from Sarc. flava, so that, when transition 

 forms 'are found, they appear only as varieties. 



Sarcina mobilis (Maurea). 



The inoculation from an original culture sent to our institute by 

 Krai resembled our Sarc. equi, very markedly in the color (grayish- 

 yellow), upon all the nutrient media and in its slow but always dis- 

 tinct liquefaction, yet the granulation in the gelatin plate cultures, 

 magnified sixty times, is still finer, somewhat like the Sarc. flava, 

 midway between this and the Sarc. equi. 



Now and then a yellowish-green fluorescence occurs upon agar and 

 gelatin, which we have observed in no other sarcina. Although the 

 granulation is fine, beautiful packets occur upon all nutrient media. 

 We were not able to see the spontaneous motion described by Maurea, 

 nor could we stain flagella. Our variety appeared to have lost the ability 

 to produce flagella. R. O. Neumann has grown a white and a yellow 

 culture. Migula, who has seen the flagella, produced a picture of 

 them. Sanies has described and illustrated by photographs a gray 

 variety of sarcina, which is actively motile and provided with 

 numerous long flagella, obtained from dung- water (C. B. L. IV, 664). 

 It may be called Sarc. fimentaria L. and N. 



Sarcina aurantiaca (Flugge, Lindner). 



(Plate 4.) 



Microscopic Appearance. Beautiful bales and 

 bunches of packets upon all ordinary nutrient media. 



Gelatin Plate. (a) Natural size: Orange-yellow, small, 

 round, dot-like colonies, which soon sink into the gelatin. 

 After five to six days the peripheral part breaks up and 

 portions of the colony swim about in the plate-shaped 

 area of liquefaction. Thus the colony appears whitish 

 orange (4, v). 



(b} Magnified fifty times. Superficial: At first round, 

 almost even-bordered colonies, pale to deep yellow, struc- 

 tureless or finely granular. The shallow funnel-shaped 

 depression appears gray. Later the border of the colony 

 is broken, fringed, and wavy, and when magnified a hun- 

 dred times presents tetrads that are single or joined in 



