“70 ACROTHECIUM PENNISETI 
of the spot hyphe are found abundantly, but they are almost absent in the 
cells around the central dead portion. 
After three or four days from infection conidiophores start coming out in 
clusters on both sides of the leaf through the stomata from a mass of mycelinm 
lying in the sub-stomatal space. They even come out from the stomata on the 
midrib. When after inoculations infection is very vigorous they come out 
from the stromatic masses in the epidermal cells. It may be recalled here that 
in field conditions they always come out from the stomata. 
8. CROSS INOCULATION EXPERIMENTS, 
In order to find out whether this fungus can attack other hosts which have — 
been also found infected by species of Acrothecium, inoculations were made on 
Andropogon Sorghum and Zea Mays. 
Leaves and ears of Andropogon Sorghum were inoculated with the bajra 
fungus, but no infection took place. 
A large number of inoculations were made on the leaves and male inflores- 
cence of Zea Mays, and it was observed that the bajra fungus can infect the 
male inflorescence, but has no effect on the leaves. 
A. lunatum, Wakker, which is found on Andropogon Sorghum leaves and 
male inflorescences of Zea Mays at Pusa, can infect to some extent, under 
laboratory conditions, the young leaves of Pennisetum typhoideum. 
9. DIAGNnosts. 
The following is the diagnosis :— | 
Acrothecium Penniseti n. sp. Spots amphigenous on leaves and glumes ; 
in size generally 2—5 cm. long and 0°5—1 cm. broad; dirty brown with 
yellowish margin. On the leaves more common along the edge and tip, and 
sometimes on the other parts including the midrib. 
Fertile hyphe rigid, erect, simple, 3—5 septate, straight or slightly bent ; 
fasciculate or solitary ; tip swollen or flexuous ; olive brown to dirty brown 
with paler tips; base sometimes swollen. They are 68'4—145-4 » long and 
T5—8'7 broad. 
Conidia borne acrogenously on the conidiophore, forming a group of 2—5 
spores ; clavate, pear-shaped or slightly bent, thick-walled, 2-3 septate, some- 
times constricted at the septa ; olive brown to dirty brown ; 30-4—41-8 long 
and 17°1—20u broad. End cells lighter in colour; middle cell broader and 
deeper in colour. 
On leaves and ears of Pennisetum typhoideum in India, 
