CLINTON: NORTH AMERICAN USTILAGINEAE. 
453 
Polycystis occulta Schl., Bot. Zeit., 10 : G02. 1852. 
Urocystis occulta Rab., Herb. Viv. Myc., ii, 393. 1856. 
Urocystis parallela Fisch. de Waldh., Pringsli. Jalirb. Bot., 7 : 107. 1870. 
p. p. 
? Urocystis Tritici Korn., Hedw., 16 : 33. 1877. 
Exsiccati: Urocystis occulta (Wallr.) Rab., on Secale cereale , Ell., N. A. 
Fungi, 292, Und. & Cook, Illustr. Fungi, 57, Seym. & Earle, Econ. Fungi, 
98, Kell., Ohio Fungi, 34. 
Sori in leaves (especially on inner side of sheaths), culm and inflo¬ 
rescence, forming linear striae usually of great length and often 
merged into a continuous stratum of dusty reddish black spore 
balls; spore balls oblong to subspherical, 16-32 p in length; sterile 
cells often incompletely covering the spores, hyaline or yellowish 
tinted, subspherical to oblong, usually with distended and uniformly 
thickened walls; spores reddish brown, oblong to subspherical, often 
with sides flattened, smooth, 1 or 2, rarely 3 or 4 in a ball, 11-18 p 
in length. 
Host: Secale cereale , Conn., Mass., Minn., N. J., N. Y., Ohio, 
Ii. I.; Nova Scotia. 
While this smut has been reported a number of times, especially 
in eastern United States, it does not seem to be so common or abun¬ 
dant as to cause any serious injury to the rye crop. The germina¬ 
tion of the spores has been described by Kuhn, Wolff, and Brefeld. 
Literature : 23, 103, 201, 202. 
Urocystis Agropyri (Preuss) Schrot. 
Uredo Agropyri Preuss, 1 Linnaea, 24 : 99. 1849. 
Thecaphora occulta Desm., PI. Crypt., iii, 653. 1859. 
Urocystis Agropyri Schrot., Abh. Scliles. Ges., Abtli. Nat. Med., 1869-72 : 
7. 1869. 
Urocystis Preussii Kuhn, Rab. Fungi Eur., 1898. 1874. 
Urocystis Ulii Magn., 2 Rab. Fungi Eur., 2390. 1878. 
Urocystis occulta var. Tritici Ell., N. A. Fungi, 293. 1879. 
Urocystis Festucae Ule, Verb. Bot. Yer. Prov. Brand., 25 : 215. 1884. 
Exsiccati: Urocystis Agropyri (Preuss) Schrot., on Agropyrum repens, 
Seym. & Earle, Econ. Fungi Clinton Ust. Supp., C 56, on Bromus ciliatus , 
1 Also in Sturm’s Deutsch. FI., iii, 25: 1. No date. 
2 This collection in the Harvard Crypt. Herb, contains only Ustilago striae- 
formis. 
