CLINTON: NORTH AMERICAN USTILAGINEAE. 
389 
Sphacelotheca occidentalis (Seym.) Clint. 
t 
Sorosporium Ellisii var. occidentalis Seym., Ell. & Ev., N. A. Fungi, 
2265. F. 1889. 
Ustilago andropogonis Kell. & Sw., Journ. Myc., 5: 12-13. Mr. 1889. 
Sphacelotheca occidentalis Clint., Journ. Myc., 8 : 141. 1902. 
Exsiccati : Sorosporium Ellisii var. occidentalis Seym., on Andropogon 
furcatus, Ell. & Ev., N. A. Fungi, 2265; Ustilago Andropogonis Kell. & Sw., 
on Andropogon provincialis, Ell. & Ev., N. A. Fungi, 2422, Ell. & Ev., 
Fungi Col., 538. 
Sori in the ovaries linear, usually J-l cm. or rarely longer, with 
prominent false membrane dehiscing from apex, rather prominent 
columella and agglutinate or finally dusty, black brown spore mass; 
sterile cells of membrane hyaline, variable in shape and size, 
adhering together rather firmly, often somewhat obscured through 
semi-gelatinization but the loose groups of the interior composed of 
more regular subspherical cells; spores often adhering together 
mechanically but not in spore balls, reddish brown, ovoid to spheri¬ 
cal, usually somewhat angled, often more elongated and irregular, 
verruculose, chiefly 12-17 p, irregular elongated forms sometimes 
even 20 p, in length. 
Hosts: Andropogon furcatus , Ivans, (type U. andropogonis ), 
N. Dak. (type), Neb. ; A. Hallii , Ivans, (type TJ. andropogonis), 
Neb.; A. Hallii var. faveolus, Ill. (cult.); A. macrourus , Calif. 
This species is closely related to Sorosporium Ellisii but the'sori 
• occur in the ovaries and the spores do not adhere in definite spore 
balls. The specimen listed on Andropogon macrourus differs 
somewhat from those on the other hosts in having more irregular 
and elongated spores. Norton reports the germination of the spores 
in nutrient solution but they merely sent out short germ tubes in 
his tests. 
Sphacelotheca Nealii (Ell. & And.) Clint, n. nom. 
Ustilago Nealii Ell. & And., Journ. Myc., 6 : 116-117. 1891. 
Sori in the ovaries or spikelets, £-2 cm. in length, oblong to 
ovate, often forming conspicuous nodules at basal part of spike, 
with evident tough whitish false membrane rupturing from apex 
and disclosing a black brown semi-agglutinated spore mass and a 
