CLINTON: NORTH AMERICAN USTILAGINEAE. 
455 
showing as a prominent reticulated envelope completely covering 
the spores, about 5-9 fx in diameter ; spores reddish brown, chiefly 
subspherical or occasionally somewhat flattened through pressure 
and then more elongated, 11-16 /x in length. 
Host: Juncus Balticus, Nev. 
This species has been collected in this country by Griffiths. In 
the specimens issued by him the smut was confined to the culm. 
Lagerheim described the fungus as occurring on the leaves. Stroh- 
meyer (169) describes the effect of the fungus on the tissues of its 
host. The writer has seen no description of its germination. 
Urocystis granulosa Clint. 
Urocystis granulosa Clint., Journ. Myc., 8 : 151. 1902. 
Sori in the spikelets, ovoid or oblong, about 5-10 mm. in length, 
chiefly confined to the inner parts but showing through the more or 
less infected glumes, forming a granular black spore mass ; spore 
balls reddish to black brown, ovoid to spherical, not easily ruptured, 
chiefly 28-50 p in length ; sterile cells reddish yellow, ovoid to 
subspherical, completely covering the spores, often somewhat indefin¬ 
ite in appearance through the collapsing of outer wall, about 8-13 fx 
in length; spores dark reddish brown, ovoid to spherical, or polyhe¬ 
dral through pressure, smooth, 1-6 rarely more in a ball, about 13- 
19 /lx in length. 
Host: jStipa comata , Ida. (type). 
This species was described from a specimen in S. M. Tracy’s 
herbarium collected by Dr. F. V. Hayden in Idahp, in 1859. It has 
also been found in the same collection at the N. Y. botanical garden. 
Although related to Sorosporium granulosum , which also occurs on 
Stipa, the latter does not have a true cortex of sterile cells and has 
larger spore balls containing more spores. The germination is not 
known. Literature: 29. 
Urocystis Hypoxyis Tliaxt. 1 
Urocystis Hypoxys Thaxt., Ann. Rep. Conn. Agr. Exp. Sta., 1889 : 153. 2 
1890. 
1 There seems to be considerable difference among authorities concerning the 
spelling of the specific name. It has been spelled Hypoxys , Ilypoxis, Hypoxy is, 
Ilypoxydis, Hypoxidis. 
2 Really in the description of plate II following page 153, the page being 
unnumbered. 
