Tilletia redfieldiae G. P. Clinton 1906

Tilletia redfieldiae Clinton, sp. nov
Sori in ovaries, apparently infecting all of the spikelets, elliptical, showing prominently between the glumes, about 4-5 mm. in length ; sterile cells hyaline, ovoid to subspherical but often somewhat polyhedral or irregular, with thick walls (3-6 /i), larger than spores, sometimes even 42 fi in length; spores reddish-brown, ovoid to spherical or occasionally more elongate or angular, with rather regular polygonal reticulations that are 2.5-5 ," wide and 2-3 ^ deep, chiefly 18-22 /i, or occasionally 2^ /*, in length.
On Poaceae :
Redfieldia flexuosa^ Nebraska.
Type collected in Hooker County, Nebraska, on Redfieldia flexuosa, by P. A. Rydberg, July 19, 1895.
This species was originally reported as Tilletia montana. It is very closely related to Tilletia asperifolia, having the large thick-walled sterile cells of that species. It differs in having a larger sorus and apparently in the reticulations of the spores being larger and extending further out at the margin, and in the sterile cells possibly being somewhat thinnerwalled. The writer is indebted for a specimen of this species to Professor Bessey.