Stemphylium Tritici sp. nov., associated with floret 
sterility of wheat 
FLORA W. PATTERSON 
Among the fungi associated with floret sterility of wheat in the 
southwest, transmitted for identification to the Bureau of Plant In- 
dustry, was a Stemphylium sp., which appears not to have been 
described. It is of considerable pathological importance; some 
artificial inoculations resulted in producing 9 per cent. of sterile 
florets: * ‘In nature the Stemphylium was prevalent on the leaves 
of wheat and almost invariably present in diseased ovaries, through 
the tissues of which the mycelium ramifies and produces conidia on 
the surface.”’ 
Stemphylium Tritici sp. nov. 
Hyphae decumbent, irregularly branched, fuliginous ; fertile 
branches upright, closely septate, 4-5 4 in diameter; conidia 
muriform, catenulate, irregular, generally clavate, constricted 
slightly at the septa, 24-35 » x 12-15 y, fuliginous, verrucose ; 
isthmus short, 3-4 » in diameter. 
In living leaves and ovaries of Triticum sativum, in Texas and 
Oklahoma, US. re 
yphis decumbentibus, irregulariter ramosis, fuligineis ; ramis 
fertilibus erectis, brevi-septulatis, 4-5 4 diam.; conidiis muriformi- 
bus, catenulatis, irregularibus, plerumque clava atis, ad septum 
leniter constrictis, 24-35 # x 12-15», fuligineis, verruculosis, 
isthmis brevibus, 3-4 » diam. 
In foliis vivis et ovariis 7ritici sativi in Texas et Oklahoma in 
Amer. bor. 
BUREAU OF PLANT INDUSTRY, 
U. S. DEPARTMENT OF AGRICULTURE, 
WASHINGTON, D, C Peck Seapeet e 
* Edw. C. Johnson. F loret +t sterility of wheat in the southwest. Paper read before 
the American Phytopathologica] Society, at Boston, Dec. 31, 1909. 
205 
