CLINTON: NORTH AMERICAN USTILAGINEAE. 
393 
Sori in the inflorescence forming lanceolate to linear bodies about 
8-15 mm. in length, often concealed by the leaf sheaths, covered 
b}^ a conspicuous whitish false membrane, sometimes with abortive 
remains of spikelets at the tip, upon rupture disclosing olive black 
dusty spore mass within which is a conspicuous columella; sterile 
cells of membrane easily separated into single, twin, or a chain of 
several cells, hyaline, ovoid to subspherical, chiefly smaller than 
the spores ; spores dark reddish brown, ovoid to chiefly subspherical 
or spherical, conspicuously verruculose, about 12-14.5 /x in length. 
Host: JEragrostis Neo-Mexicana, Ariz. (type S. strangulans). 
The single collection of this species in America was made by 
Griffiths in the Santa Rita Mountains. The specimens show the 
Sphacelotheca type of structure very plainly. This was not shown 
so evidently in the meager specimen examined of the type of 
Ustilago strangulans , though there is apparently no reason for 
considering them distinct. Literature: 74. 
Sphacelotheca Reiliana (Kuhn) Clint. 
TJstilago Reiliana Kuhn, Rab. Fungi Eur., 1998. 1875. 
Ustilago Reiliana forma Zeae Pass., Boll. Com. Agr. Parrn., 1876 . 1876. 
Ustilago pulveracea Cke., Grev., 4 : 115. 1876. 
Cintractia Reiliana Clint., Bull. Ill. Agr. Exp. Sta., 57 : 346. 1900. 
Ustilago (Cintractia ) reiliana forma foliicola Kell., Ohio S. U. Nat., 1 : 
1900. 
Sphacelotheca Reiliana Clint., Journ. Myc., 8 : 141. 1902. 
Exsiccati: Sphacelotheca Reiliana (Kuhn) Clint., on Sorghum vulgare , 
Seym. & Earle, Econ. Fungi Clinton Ust. Supp., C45; Ustilago Reiliana 
Kuhn, on Sorghum vulgare, Ell. & Ev., N. A. Fungi, 3564, Seym. & Earle, 
Econ. Fungi, 547. 
Sori very prominent, forming irregular masses including more or 
less of the entire panicle, usually 5—15 cm. in length, often at first 
protected by leaf sheath, with evident whitish false membrane 
enclosing the black brown spore mass and ray-like remains of the 
peduncles or columellas, in time becoming ruptured and spores scat¬ 
tered ; sterile cells, besides forming membrane, scattered in usually 
subspherical groups through the spore mass, chiefly subspherical, 
7-15 fx in diameter ; spores somewhat opaque, chiefly subspherical 
to spherical or occasionally ovoid or slightly angled, minutely but 
abundantly verruculose, 9-14 g in length. 
Hosts: Sorghum vulgare , la., Ill., Kans., Minn., Miss., Neb., 
N. J., Ohio, Tex.; Zea Mays , Ivans., Ohio. 
