Part 1, 1906] TIIvLBTlACBAE 51 



brown spore-mass; sterile cells smaller than spores, often with thick smooth wall; spores 

 slightly tinted to light golden-brown, chiefly subspherical or spherical, occasionally ovoid, 

 with coarse bluntish tubercles extending out about 2 fi to the evident hyaline envelope, 

 chiefly 18-22 fi in diameter. 



On Poaceae : 



Agropyron occidentale. South Dakota. 

 Type locality : Aberdeen, South Dakota, on Agropyron occideniale. 

 Distribution : Known only from its type locality. 

 Illustration : Bull. Torrey Club 29 : 291,/. 2. 

 ExsiCCATi : Griff. West Am. Fungi J27. 



14. TiUetia texana I,ong; Clinton, Jour. Myc. 8: 149. 1902. 



Sori in ovaries, ovoid or oblong, about 3-5 mm. in length, often more or less hidden by 

 enveloping glumes, forming a somewhat agglutinated light reddish-brown spore-mass ; 

 sterile cells not very numerous, hyaline, with very thick often lamellate walls and central 

 contents ; spores very light-colored, orange-yellow (appearing as if somewhat immature), 

 chiefly subspherical or spherical, with prominent conical tubercles (blunt or sometimes 

 quite pointed) which extend out 2-3 // to the evident hyaline envelope, chiefly 19-25 ^ in 

 diameter (including envelope). 



On Poaceae : 



Hordeum nodosum [H . pratense) ^ Texas. 

 Type locality : Austin, Texas, on Hordeum pratense {H. nodosum,). 

 Distribution : Known only from the type locality. 



15. TiUetia Wilcoxiana Griff. Bull. Torrey Club 31 : 88. 1904. 



Sori in ovaries, usually showing through the basal parts of the glumes, about 1.5- 

 2.5 mm. in length, ovoid to ellipsoidal, frequently somewhat flattened, covered by plant 

 membrane that usually bears the styles at its apex, upon rupture disclosing a reddish-brown 

 spore-mass ; spores slightly tinted (appearing as if immature), with evident hyaline en- 

 veloping membrane, subspherical to spherical, thick-walled with tubercles showing promi- 

 nently. at margin, 18-22^ in diameter. 



On Poaceae : 



Stipa eminens Andersoni, California. 

 Type locality : Santa Monica, California, on Stipa eminens Andersoni. 

 Distribution : Known only from the type locality. 

 Illustration : Bull. Torrey Club 31 : 85,/. 17. 



16. Tilletia buchloeana Kellerm. & Swingle, Jour. Myc, 5 : 11. 1889. 



Sori in ovaries, ovoid, 1-2 mm. in length, showing between or often concealed by 

 enveloping glumes, with dark reddish-brown spore-mass ; sterile cells hyaline, subspherical, 

 with very thick lamellate wall and comparatively small central contents, somewhat more 

 variable in size than the spores; spores light chocolate-brown, chiefly subspherical or 

 spherical, with prominent short blunt tubercles often reaching only half way to outer 

 margin of the prominent hyaline membrane which forms a band usually 2-4 /* wide and 

 shows papilla of attachment, 17-22 fi in length. 



On Poaceae: 



Bulbilis daciyloides {Buchloe daclyloides) , Kansas. 

 Type locality: Trego County, Kansas, on Buchloe daciyloides (^Bulbilis daciyloides), stami- 



nate plants. 



Distribution : Kansas. 



Illustration : Jour. Myc. 5 : pi. l,f. 1-11. 



17. TiUetia Cathesteci (P. Henn.) Clinton, Jour. Myc. 8 : 149. 1902. 



Ustilago Cathesteci P. Henn. Hedwigia 36 : 212. 1897. 



Sori in ovaries, ovoid, about 1 mm. in length, often inconspicuous and with styles still 

 attached, more or less concealed by the glumes, with black-brown spore-mass ; sterile cells 

 hyaline, with very thick wall, less common than the stages of immature spores ; mature 

 spores chocolate-brown, chiefly subspherical or spherical, with prominent conical tubercles 

 (becoming blunt and less conspicuous with maturity) which extend out half way or more 

 to the very evident hyaline membrane, chiefly 19-24 /ti (exclusive of envelope) in diameter. 



