454 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Seym. & Earle, Econ. Fungi, 99, on Elymus Canadensis , Seym. & Earle, 
Econ. Fungi, 100, Same, Clinton Ust. Supp., C 57, on Elymus Virginicus , 
Seym. & Earle, Econ. Fungi Clinton Ust. Supp., C 58 ; Urocystis occidta 
(Wallr.) Rab., on Calamagrostis Canadensis , Griff., West Amer. Fungi, 
222 , Urocystis occulta (Wallr.) Rab. var. Tritici, on Triticum repens, Ell., 
N. A. Fungi, 293. 
Soii in various parts, most commonly in leaves, forming striae a 
few mm. to length of leaf, distinct or covering surface of leaf, at 
first lead colored and protected by epidermis but soon rupturing and 
reddish brown spores becoming scattered ; spore balls oblong to sub- 
spherical, 16-32 p in length ; sterile cells hyaline to yellowish, oblong 
to subspherical, usually completely covering fertile cells, outer wall 
apparently thin and by collapsing with age giving ridged effect to 
the covering ; spores 1 or 2, rarely 3 or 4 in a ball, reddish brown, 
oblong to subspherical, often with flattened sides, smooth, 11—18 M 
in length. 
Hosts : Agropyrum divergens, Wash. ; A. occide?itale, N. Mex. ; 
A. repens , Mass., Yt.; Bromus ciliatus , la.; Bromus sp., Minn.; 
Calamagrostis Canadensis , Ore.; Elymus arenarius, Greenland; 
A. Canadensis , la., Ill., Ivans., Mo., Neb., Wise. ; E. robustus , la. ; 
E. Virginicus , Ill., Wise.; Elymus sp., Colo., Minn. 
1 his smut is often associated with Ustilago striae^ or mis . when a 
microscopical examination is necessary to distinguish k them. Uro¬ 
cystis Agropyri has, at times, been considered identical with Uro¬ 
cystis occulta. It differs in having the sterile cells completely 
covering the spores; the sterile cells also seem to collapse more 
generally. It is also very closely related to Urocystis Fisclieri 
Koi n., on Carex sp., but this species has not yet been reported in 
this country. 
Urocystis Junci Lagh. 
Urocystis Junci Lagh., Rev. Myc., 11 : 66. 1889. 
Exsiccati: Urocystis junci Lagh., on Juncus Balticus, Griff, West Amer. 
Fungi, 221. 
Sori in the culms, filling the interior, eventually rupturing and dis¬ 
closing dusty brown black spore mass; spore balls variable, chiefly 
of 1-8 spores but rarely of more, 16-36 p, or occasionally 50 p, in 
length; sterile cells dark reddish brown, easily collapsing and then 
