258 ON SOME RUSTS AND MILDEWS IN INDIA. 



These were collected at the end of the winter 1889-90. " Jowari " 

 is usually a hot- weather ("kkarif") crop; but a cold-weather, or 

 " rabi," crop is grown in some parts. The specimens of the 

 fungus I obtained were from the Poona Farm on " Shalu," a cold- 

 weather Jowari. The leaves were spotted irregularly on both 

 sides with oval reddish-brown spots, black in the centre. The 

 black central parts of the spots were teleutospore pustules, and 

 tbese, though really naked, were overlapped by the raised and rent 

 epidermis. 



On examining some spores scraped from these pustules they 

 were found to consist mainly of Puccinw spores with some uredo- 

 spores. 



The uredospores are brown, oval bodies, with the place of 

 attachment to the stalk usually clearly marked. After lying 

 twenty-four hours in water they measured 3-4-30 x 22-20 \x. The 

 epispore is beset with shallow warts, and pierced by 4 to 5 germ- 

 pores on the short equator of the spore. They did not germinate 

 (fig. 1«.) 



The teleutospores are deep brown and usually rounded at both 

 ends (fig. lb. c), though some are slightly narrowed towards the 

 apex. They are slightly constricted at the septum, and a piece of 

 stalk remains adherent. They are therefore rather firmly adherent 

 to the host. The epispore is uniformly thick and quite smooth. 

 After lying twenty-four hours in water they measured 50-41 x 

 29-22 ii. 



Among the seraped-off uredo and teleutospores are numerous 

 large capitate or club-shaped paraphyses ; some of these are 

 colourless, whilst others are deep brown (fig. 1, d.). 



After lying in water tbree days (24 x 3 hours) many ger- 

 minated in the usual way, the promycelia being colourless. The 

 sporidia are abstricted from long sterigmata ; they are colourless 

 and oval, measuring 15 x 10 /x (figs. 2, 3). 



Remarks. — This affection, known locally as " Kani," is possibly 

 P. Sorghi Schweinitz, and I have named it so provisionally, but it 

 is quite possibly a new species. I am the more inclined to think 

 it is a new species, because I have never seen nor received 

 specimens on Zea Mays in India ; and as the latter is very exten- 

 sively cultivated, this is unexpected on the assumption that the 

 fungus is P. Sorghi. Still, as I have not had good opportunities 

 for obtaining information about the existence of any Bust on 

 Zea, it is quite possible that it exists. Assuming the fungus on 

 Sorghum to be P. Sorghum, the Indian species differs especially in 

 having considerably larger uredo and teleutospores ; in the teleuto- 

 spores not being thickened at the free ends ; and in the spores 

 being associated with paraphyses. The differences in the spore 

 measurements are best shown tabularly — 



Die Pilze Schlesiens.' t ' Sylloge Fungorum.' 



