18 SOME DISEASES OF CEREALS, 
It remains only to determine the species’to which these 
Indian Sclerospora parasites belong. After a careful examination 
of all my material and comparison with the specimens of Sel. 
graminicola issued in Sydow’s Phycomycetes and Protomycetes 
(Nos. 36, 37 and 165) and Scl. macrospora issued in Briosi and 
Cavara’s Funghi pavassiti No. 352, no doubt remains that the 
Pennisetum parasite is Scl. graminicola. This is somewhat sur- 
prising when we consider the much wider range of hosts in Sel. 
macrospora, while this is the first time that Scl. graminicola has 
been found on other hosts than Setaria. The sporangial stage 
agrees fully with that already described in Germany by Schroter 
(1879) and Fischer (1902), and in Japan as figured by Arata 
Ideta (1903), though the sporangia are larger, being 22-304 by 
12-16 as against 20 by 15-18" (Fischer). The sporangia are, 
however, variable bodies, since Berlese (1902) quotes measurements 
by Matbranche and Letendre, giving 12-15 by 10-1l# as the 
diameter. Scl. graminicola is so far the only species known to 
have this stage, if weomit Peronospora Maydis. 
The hybernating spore also agrees. Traverso (1902 (1) ) gives 
a very full description of the fruit and finds from a number of 
measurements that the oogonium averages 45°9 in diameter and 
the oospore 324. The measurements given above for the Pennise- 
tum parasite (42u and 32 respectively) agree in the most im- 
portant item, the oospore, and are much smaller in both than the 
corresponding measurements for Scl. macrospora. The specimens 
in Sydow’s exsiccata collected by Sydow on Setaria glauca near 
Berlin (No. 36) and by Kabat on 8. viridis in Bohemia (No. 165) 
agree in measurements, and in the colour and shape of the fruit, 
very closely with the Indian fungus. Excepting, therefore, the dif- 
ference of hosts the Setaria and Pennisetum Sclerosporas agree in 
all respects. 
The fungus on Andropogon Sorghum corresponds with the 
above in the oogonial stage, which alone has been found. It is, 
of course, possible that sporangia will be found on this host also, 
when it is more fully examined, as I have not had sufficient oppor- 
tunity for watching it on the living plant. In all the systematic 
