Dastur . — Cytology of Tilletia Tritici , ( Bjerk .) Wint. 405 
he has described is quite unlike that generally occurring in the Tilletiaceae. 
The young angular spores he has figured are very similar to those of an 
Ustilago, and he finds that the spores are formed inside a hypha ; it seems 
possible that this ‘hypha 5 is the mucilaginous sheath round the immature 
spores, which is so characteristic of Ustilago. 
Text-figs. 1-7. Penetration of the infecting hyphae through the epidermal intercellular spaces. 
The hyphae have one or more nuclei, x 1,200. Fig. 8. Penetration of the infecting hypha directly . 
through the lumen of the epidermal cell. . x 1,200. Fig. 9. Multinucleate mycelium in the tissues 
of the leaf-sheath, x 1,200. 
The observations recorded in the present investigations show that the 
binucleate condition is of very short duration, the secondary sporidium being 
as a rule uninucleate. This difference between these observations and 
those of the previous workers is, however, not fundamental, but only one 
