248 GRASSES OP IOWA. 



affected plants. It affects the ovaries. The spores are dark 

 brown or black, sub-globose or slightly oval.* The fungus 

 appears to be closely allied to if not identical with Sorosporium 

 eZ//.s«', Winter, t and this specific name should therefore be 

 used. The Cerebella is allied to the Sorosporium; one species, 

 the C. spartince, occurs and affects the spikelets of slough grass. 

 The UstUago aristldce, Pk. , was described by Peck. I It occurs 

 upon Artistida purpurea. It is common in parts of Nebraska 

 where the writer has found it covering wide areas. It has 

 been reported by Norton from Kansas. This smut fills the 

 ovaries, and the awns are much shorter than usual. An 

 Ustilago also occurs on Sporoboius, vagimejforu.s, the U. vilfa'.% 

 The Ustilago spermophora, B rkley and Curtiss || is vfry common 

 at times on Eragrostis major. Generally only a few of the 

 ovaries are smutted, but in some cases entire section? of the 

 panicle were affec'ed. The spores are sub-globose and 

 minutely roughened. During the past season, 1899, it was 

 extremely common here in this state. 



BUNTS (TILLETIA). 



Wheat is attacked by two species of bunt in this country, 

 the Tilletiafoetens (B. & C.) Schroeter, and Tilletia tritici (Bjerk) 

 Winter. Of these the former is far more common. Both are 

 exceedingly destructive to wheat. 



TilUtia foetens ( B. & C.) Schroeter. This fungus was first 

 described by Berkeley and Curtiss;^i earlier than this it was 

 recognized by Wallroth.** Kuehn, in J 874, gave it the name of 

 T. laevis. It usually passes under this name in European 

 mycological works, so given by Sorauer,tt FrankJJ and 

 Tubeuf.§§ This name is also used in Massee'sl || monograph on 

 Tilletia. The present combination was made by Schroeter. H 



*Norton. Trans. Acad. Sci. St. Louis. 7: 236. 



tBedwigla. 22: 2. 1883. Saccardo Syll. Fung 7: 513. 



*Bull. Torr. Bot. Olub. 12:3). pf. ^5. l!)-2:i See also Norton. Trans. Acad. Scl. St 

 Louis. 7: 232. 



SWinter. Bull. Torr. Bot. Club. 10: 7. 



llOurtlss. Cat. N. Carolina. 123. Syll. Fung. 7; 466. 



^Rtvenel. Fungi. Car. 100. Berkeley. Notices of No. Am. Fungi. 573. Grevll- 

 lea. 3: 59. 



♦♦Flora Crypt. Germ. 2: 213. W(U, 1S33. 

 Rabeniiorst. Fungi Kurop. 1697. 

 Iledwigla /3: 1,52. Winter die. Pl'z^. 1: 109. 



T+Pfianzenkraaltlieiten. 183. 



ttKrankheltender Fflanzen. 118. f. 20-21. 



§§Pflanzenkrankheiten. 326. 



IMIBuU. Miscel. Int. Kew. 1899: 141. 



TTBemerkungen und Beobachtungea ueber Dstllagineen._ Colin. Beitrage zur Blo- 

 Ogied. Pflanzen. 2: 365, 1888. 



