340 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
Exsiccati : Ustilago longissima (Sow.) Till., on Glyceria grandis, Ell. 
& Ev., N. A. Fungi, 1096, Ell. & Ev., Fungi Col., 409, Seym. & Earle, Econ. 
Fungi, 541, Seym. & Earle, Econ. Fungi, Clinton Ust. Supp. C 73, C 74. 
Sori in leaves, forming more or less distinct and linear groups 
from a few mm. to length of the leaf, soon rupturing epidermal cov¬ 
ering and the reddish brown spore mass becoming scattered from 
the more or less shredded tissues ; spores light brown, oblong or 
ellipsoidal to spherical, smooth or scarcely granular under an immer¬ 
sion, 4-8 y in length. 
Hosts: Glyceria arundinacea , la., Minn.; G. grandis , Conn., 
Mass., Mich., N. Y., Vt., Wise. ; Glyceria sp., N. H. 
The spores of the American specimens average slightly larger 
than those of the European ; on the host Glyceria fluitans they are 
so much larger that Davis has described this form as a distinct 
variety. The germination has been reported by Fischer de Wald¬ 
heim, Brefeld, and others. Literature : 20, 44. 
Ustilago longissima var. macrospora Davis. 
Ustilago longissima var. macrospora 1 Davis, Ell. & Ev., N. A. fungi, 3235. 
1895. 
Exsiccati: Ustilago longissima var. macrospora Davis, on Glyceria 
fluitans , Ell. & Ev., N. A. Fungi, 3235, Seym. & Earle, Econ. Fungi, 540, 
Syd., Ust., 253, Seym. & Earle, Econ. Fungi, Clinton Ust. Supp. C 75. 
Sori as in species ; spores also similar except somewhat more irreg¬ 
ular and angled, apparently smooth but under an immersion minutely 
granular, 7-12 y in length. 
Hosts: Glyceria fluitans, Ill., Me., Wise, (type) ; G. laxa , Me. 
The form on Glyceria. ; laxa from Maine in the specimen exam¬ 
ined is somewhat intermediate between this and the species. Lit¬ 
erature : 43. 
Ustilago calcara Griff. 
Ustilago calcara Griff., Bull. Torr. Bot. Club, 31 : 85. 1904. 
Sori in the leaf sheaths, occasionally in the blades, extending 
between the veins and rupturing upon the exterior, circular, J mm. 
in diameter or linear through confluence and then often 5 mm. or 
1 Davis gives a short description of this in Trans. Wise. Acad. Sci. Arts 
& Lett., 11 : 174. 1897. 
