^0 NORTH AMERICAN FivORA [V01.UME 7 



ment at one side, with reticulations of wall somewhat irregular forming polygonal or some- 

 times more elongate areas and occasionally with free ridges projecting into these, with the 

 reticulations showing at circumference as straight projecting spines, 17-25 n in length. 



On Poaceae : 



Sporobolus gracUlimus, Rocky Mountains. 



Sporobolus simplex, Montana. 

 Type locality : Rocky Mountain region, on Sporobolus gracUlimus . 

 Distribution : Montana. 

 ExsicCATi: Griff. West Am. Fungi 225. 



10. Tilletia Redfieldiae Clinton, sp. nov. 



Sori in ovaries, apparently infecting all of the spikelets, elliptical, showing promi- 

 nently between the glumes, about 4-5 mm. in length ; sterile cells hyaline, ovoid to sub- 

 spherical 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 occa- 

 sionally 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 thinner- walled. The writer is indebted 

 for a specimen of this species to Professor Bessey. 



11. Tilletia asperifolia Ellis & Ev. Jour. Myc. 3 : 55. 1887. 



Sori in ovaries, ovoid, about 1 mm. in length, showing somewhat through and between 

 the hyaline enveloping glumes, usually occurring in all the spikelets ; sterile cells hyaline, 

 chiefly ovoid to subspherical, with very thick (occasionally even 8 fj-) indistinctly laminate 

 walls and central oil or granular contents, large, usually 25-38 fi in length ; spores reddish- 

 brown, chiefly ovoid to spherical, occasionally more elongate or Somewhat angular, with 

 r-ather regular polygonal reticulations that are about 2-3 fi wide extending out at the cir- 

 cumference about \ fi so that the enveloping membrane is rather closely applied, chiefly 

 17-22 ^, rarely 25 //, in length. 



On" Poaceae : ^ \ 



Sporobolus asperifoliuSy Arizona, Colorado, Montana, Nevada, New Mexico, Oregon, fotah,) 

 Washington, Wyoming. ^"-^'^ 



Type locality : Rocky Mountain region, on Sporobolus asperifolius. 

 Distribution : Montana to New Mexico, Arizona, and Washington. 



12. Tilletia Maclagani (Berk.) Clinton, Jour. Myc. 8 : 148. 1902. 



Ustilago Maclagani Berk. Grevillea 3 : 58. 1874. 



Ustilago rotundata Arth. Bull. Iowa Agr. Coll. Dep. Bot. 1884 : 173. 1884. (Type from Iowa, on 



Tilletia rotundata Massee, Kew BuU. 1899 : 145. 1899. 



Sori in ovaries and occasionally in anthers, inconspicuous, concealed by the enveloping 

 glumes, upon rupture shedding out a dusty red-brown spore-mass; spores showing differ- 

 ent stages of development, the older light to dark reddish-brown, chiefly subspherical or 

 spherical though occasionally more elongate or somewhat irregular, with a thick wall 

 (3_4 ^ ) apparently closely covered with verruculations (really very minutely areolately 

 pitted), 18-27 \i in length. 



On Poaceae : 



Panicuni virgatutn, Connecticut, Iowa, Kansas, Nebraska ; Quebec. 

 Type locality : Montreal, Canada, on Panicum virgatum. 

 Distribution : Quebec, Connecticut, Iowa, Kansas and Nebraska. 

 Illustration : Bull. Conn. Geol. Nat. Hist. Surv. 5 ; /. 11. 

 ExsiCCATi : Seym. & Earle, Keen. Fungi C 126 ; BHis & Kv. N. Am. Fungi 1894. 



13. Tilletia Earlei Griff. Bull. Torrey Club 29 : 290. 1902. 



Sori in culms usually affecting next to upper internode, forming a somewhat swollen 

 body 1-10 cm. in length, rupturing by longitudinal fissures which disclose a semi-dusty light- 



