SPOROBOLOMYCES 



187 



which in due course produced and discharged a second spore (E-H) ; 

 and then, after another interval of 2 hours 45 minutes, a third 



Fig. 93. — Sporobolomyces roseus. A spore which, after being shot away from a 

 colony of yeast cells, fell on to an almost exhausted medium and which, 

 instead of producing yeast cells in the usual way, gave rise in the course of 

 about 7 hours to three new spores in succession. A-D, E-G, and H-J, the 

 production and discharge of the first, second, and third spores respectively. 

 A, the original spore, of large size, lying on the surface of the medium and 

 seen from above : it has produced a central sterigma on its upper surface ; 

 the shading represents the cytoplasmic contents. B (40 minutes after A) : 

 the first new spore sp is developing at the top of the sterigma. C (70 minutes 

 after A) : the first new spore sp is now fully grown ; st, the sterigma ; c, the 

 cytoplasm ; v, a vacuole. D (90 minutes after A) : the first new spore has 

 been discharged and the sterigma is again in full view ; the vacuole has 

 altered its shape. E (2 hours and 10 minutes after A) : a second sterigma 

 has been formed on the right of the first ; the vacuole has diminished in 

 size and is rounder. F (four hours after A) : the second new spore sp has 

 been developed on the second sterigma st ; v v, two vacuoles one at each end 

 of the original spore ; c, the cytoplasm. G (4 hours and 5 minutes after 

 A) : the second spore has just been discharged ; the vacuoles have increased 

 in size. H (5 hours and 50 minutes after A) : the third new spore sp is 

 developing on the first sterigma. I (6 hours and 25 minutes after A) : the 

 third new spore sp is now fully grown ; the lower vacuole has increased in 

 size again. J (7 hours after A) : the third new spore has been discharged ; 

 the lower vacuole has increased in size. Three hours after the stage J, no 

 other spore had been produced. Drawn by A. H. R. Buller and Ruth Macrae. 

 Magnification, 2100. 



sterigma began to develop, which in its turn produced and discharged 

 a third spore (I-L). Whether or not another sterigma or another 

 spore was developed was not determined. 



