390 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
more or less evident columella ; sterile cells hyaline, often adhering 
in groups, usually subspherical and larger than spores; spores red¬ 
dish brown, ovoid to chiefly subspherical, often angular, usually 
smooth, chiefly 7—11 /a in length. 
Host: Heteropogon melanocarpus (II. acuminatus) , Fla. (type); 
Mex. (Chapala and Guadalajara). 
Through the kindness of Prof. F. S. Earle the type of this has 
been examined. The Mexican specimens, collected the past fall by 
Mr. E. W. D. Holway, agree very well with the type. Specimens 
from Florida are in some collections, apparently under the herbarium 
name Ustilago Floridana Ell. & Ev. The species unquestionably 
belongs under Sphacelotheca, as placed here. The sori are often 
very conspicuous and Ellis in his description says : “ The lower 
lateral solitary spikelets when attacked are changed into irregular 
roundish knots or nodules as large as a medium sized pea.” In 
other cases the sori are comparatively inconspicuous. 
Sphacelotheca Xschaemi (Fckl.) Clint. 
JJstilago Ischaemi Eckl., Enum, Fung. Nass., 22. 1861. 
Ustilago cylindrica Pk., Bot. Gaz., 7 : 55. 1882. 
Cintro,ctia Ischaemi Syd., Oesterr. Bot. Zeitsch., 51 : 12. 1901. 
Sphacelotheca Ischaemi Clint., Journ. Myc., 8 : 140. 1902. 
Exsiccati : Sphacelotheca Ischaemi (Fckl.) Clint., on Andropogon scopa- 
rius, Seym. & Earle, Econ. Fungi Clinton Ust. Supp., C 44, on Andropogon 
furcatus , Fungi Col., 1783 ; Ustilago cylindrica Pk., on Andropogon Torrey- 
anus, Griff., West Amer. Fungi, 216, 216 a . 
Sori often involving entire inflorescence, linear, usually enclosed 
by leaf sheaths, about 10—30 mm. in length by 1—3 mm. wide, with 
false membrane soon rupturing and black brown spore mass 
becoming scattered, eventually leaving behind the naked columella; 
sterile cells besides forming false membrane also scattered through 
spore mass in subspherical groups 25-40 /x in diameter, the individ¬ 
ual cells being hyaline, subspherical, flattened where in contact, 
7-18 g in diameter ; spores usually ovoid to spherical, smooth or 
sometimes very minutely granular, 7-10 /x in length. 
Hosts : Andropogon contortus, Ariz., Mex. ; A. furcatus , Ivans.; 
A. saccharoides , Mex.; A. scoparius, Ill.; A. Torreyanus , Ariz., 
Tex.; Andropogon sp 0 Ariz. (type U. cylindrica'). 
This species is very closely related to Sphacelotheca Andropo- 
