156 IMPORTANT VARIETIES OF FISSION-FUNGI. 



Agar Plates. — (a) Natural size : Like gelatin plate, 

 only somewhat whiter. 



(b) Magnified fifty times. Superficial : Round, light to 

 dark gray, periphery lighter, transparent; tetrads visible 

 as tiny crumbs. Deep : Roundish, dark, finely granular. 



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

 growth: Grayish- white, shining, slightly elevated; after 

 three weeks 4 mm. to 5 mm. in diameter. 



Agar Streak. — Restricted to the streak ; rather scanty 

 growth ; grayish-white, transparent, wavy, usually made 

 up of single crumbs. Water of condensation clear with 

 slight sediment (6, vn and 5, n). 



Bouillon Culture. — Clear, little deposit, friable. 



Milk Culture. — Milk very slowly becomes clear, with- 

 out preceding coagulation. 



Potato Culture. — Very poor growth ; after three to 

 four weeks a growth 3 to 4 mm. wide, yellowish-gray to 

 brownish, shining, not sharply outlined from the potato 

 (6, ix). 



Spores. — Typical, round spores first observed by 

 Hauser ; according to Hauser, they stain well. 



Occurrence. — So far found only in the air passages of 

 men — for example, in cases of phthisis — apparently as 

 harmless settlers ; according to Hauser, are not pathogenic 

 for animals. 



The following appears very similarly (but always lacks 

 spores and flagella) : 



Sarcina fulva (Stubenrath). 



In microscopic findings upon all nutrient media, in distribution and 

 consistency, liquefaction, etc., almost exactly like the preceding, but is 

 brownish-yellow to reddish-brown, and transparent upon agar and gelatin ; 

 on the contrary, upon potato scarcely to be distinguished from Sarc. 

 pulmonum. Bouillon becomes turbid, with tough crumbly sediment. 

 Grown with oxygen it forms some H 2 S, and rather abundant acid upon 

 grape-sugar bouillon and milk. Upon all nutrient media it forms 

 bunches and bales of packets, but of various sizes. 



Cultivated in Wurzburg many times from stomach contents and once 

 from preputial smegma ; a very striking and slowly growing variety. 



