26 NORTH AMERICAN FLORA [Volume 7 



tents, apparently smooth, chiefly subspherical or slightly polyhedral, occasionally ovate or 

 ovoid, 7-12 // in length. 



On Poaceae : 



Andropogon virginicus, Alabama, North Carolina. 



Andropogon sp., Georgia. 

 Type locality : Auburn, Alabama, on Aiidropogon virginicus. 

 Distribution : North Carolina, Georgia and Alabama. 

 BxsicCATi: Sydow, Ust. 189; Seym. & Earle, Econ. Fungi 531, C 122. 



3. Sphacelotheca Chrysopogonis Clinton, Proc. Bost. Soc. 



Nat. Hist. 31 : 387. 1904. 



Sori usually in all the ovaries of the panicle, linear-oblong, about 3-5 mm. in length, 

 showing between the spreading glumes, with sterile membranes as well as the semi-agglu- 

 tinated black-brown spore-mass gradually wearing away, leaving behind the small but evi- 

 dent columella ; sterile cells hyaline, often separating into groups, subspherical, averaging 

 slightly larger than the spores; spores reddish-brown, ovoid to chiefly subspherical, occa- 

 sionally angled, often with punctate contents, apparently smooth, chiefly 8-11 fi in length. 



On Poaceae : 



Sorghastrtini nutans {Chrysopogon nutans)^ Mexico. 

 Type locality: Chapala, Mexico, on Chrysopogon nutans {Sorgkastrutn nutans). 

 Distribution : Mexico. 

 ExsiCCATi : Seym. & Earle, Econ. Fungi C 118. 



4. Sphacelotheca Nealii (Ellis & And,) Clinton, Proc. Bost. 



Soc. Nat. Hist. 31 : 389. 1904. 



Ustilago Nealii Ellis & And. Jour. Myc. 6: 116. 1891. 



Sori in the ovaries or spikelets, 0.5-2 cm. in length, oblong to ovate, often forming con- 

 spicuous nodules at basal part of spike, with evident tough whitish false membrane ruptur- 

 ing from apex and disclosing a black-brown semi-agglutinated spore-mass and a more or 

 less evident columella ; sterile cells hyaline, often adhering in groups, usually subspheri- 

 cal and larger than spores; spores reddish-brown, ovoid to chiefly subspherical, often an- 

 gular, usually smooth, chiefly 7-11 ^ in length. 



On Poaceae : 



Heteropogon melanocarpus (H. acuminatus), Florida; Mexico. 

 Type locality : I^ake City, Florida, on Heteropogon melanocarpus. 

 Distribution: Florida and Mexico (Chapala and Guadalajara). 

 ExsiccATi : Seym. & Earle, Econ. Fungi C119, C 120. 



5. Sphacelotheca monilifera (Ellis & Ev.) Clinton, Jour. 



Myc. 8 : 141. 1902. 



Ustilago monilifera Ellis & Ev. Bull. Torrey Club 22 : 362. 1895. 



Ustilago Andropogonis-contorti P. Henn. ; Clinton, Jour. Myc. 8 : 141, as a synonym. 1902. 



Sori in ovaries of the spikelets, elongate, 4-7 mm. or about the length of the glumes 

 and often completely concealed by them, with evident false membrane that ruptures into 

 irregular lobes and discloses a brown-black spore-mass, with evident columella ; cells of false 

 membrane adhering rather permanently, with those of the interior in loose subspherical 

 groups, hyaline or slightly tinted, chiefly subspherical, about the diameter of the spores ; 

 spores reddish-brown, chiefly ovoid to spherical or somewhat angled, rather minutely ver- 

 ruculose or echinulate, 9-13 // in length. 



On Poaceae : 



Heteropogon contortus {Andropogon contortus)^ Arizona ; Mexico. 

 Type locality : Tucson, Arizona, on Heteropogon contortus. 

 Distribution : Arizona and Mexico ; also in Hawaii. 

 Exsiccati : Griff. West Am. Fungi 215. 



6. Sphacelotheca diplospora (Ellis & Ev.) Clinton, Jour. 



Myc. 8 : 140. 1902. 



Ustilago diplospora Ellis & Ev. Jour. Myc. 6 : 119. 1891. 



Sori in the ovaries of only part of the spikelets, rather inconspicuous, showing between 

 the spreading glumes which they rarely exceed in length, with evident false membrane that 



