370 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Sori very elongated, often 1 or more dcm. in length, at apex of 
culm, enveloped by leaves and leaf sheaths, apparently infecting 
inner leaves as well as inflorescence and changing these into 
elongated shredded filaments scattered among the at first agglu¬ 
tinated but finally dusty olive black spore mass; spores dark reddish 
brown, chiefly ovoid or ovate to spherical, rather prominently 
verruculose, 9-14 /x in length. 
Host: Tripsacum dactyloides, Mex. (type). 
The very elongated sorus is peculiar. The germination of the 
spores has not been described. 
Ustilago striaeformis (West.) Niessl. 
Uredo longissima var. Hold Ces., Ivlotz-Rab. Herb. Yiv. Myc., 1498. 1850. 
Uredo striaeformis West., Bull. Acad. Roy. Belg., 18 2 : 406. 1852. 
Uredo longissima var. megalospora Riess, Klotz-Rab. Herb. Yiv. Myc., 
1897. 1854. 
Tilletia de-Baryana Fisch. de Waldh., Rab. Fungi Eur., 1097. 1866. 
Tilletia Milii Fckl., Symb. Myc., 1 : 40. 1869. 
Ustilago striaeformis Niessl, Hedw., 15 : 1. 1876. 
Tilletia striaeformis Oud.. Bot. Zeit., 36 : 440-441. 1878. 
Tilletia alopecurivora Ule, Verb. Bot. Yer. Prov. Brand., 25 : 214. 1884. 
Tilletia Brizae Ule, Verh. Bot. Ver. Prov. Brand., 25 : 214. 1884. 
Ustilago Washingtoniana Ell. & Ev., Bull. Torr. Bot. Club, 22 : 57. 1895. 
Exsiccati: Tilletia striaeformis (West.), on Ammophila arundinacea, 
Seym. & Earle, Econ. Fungi, 77 ; on Phleum pratense, Ell. & Ev., Fungi 
Col., 1370, Seym. & Earle, Econ. Fungi, 76, Ell., N. A. Fungi, 1498; on 
grass, Und. & Cook, Illust. Fungi, 58; Ustilago striaeformis (West.) Niessl, 
on Agrostis alba var. vulgaris, Seym. & Earle, Econ. Fungi Clinton Ust. 
Supp., C 89, on Elymus Virginicus, Seym. & Earle, Econ. Fungi Clinton 
Ust. Supp., C 90 ; on Phleum pratense, Seym. & Earle, Econ. Fungi Clinton 
Ust. Supp., C 91; on Poa pratensis, Seym. & Earle, Econ. Fungi Clinton 
Ust. Supp., C 92. 
Sori in leaves, rarely in the inflorescence, from short-linear often 
extending apparently by terminal fusion for several cm., also 
occasionally fusing laterally to cover most of leaf, at first covered by 
epidermis but this soon ruptured and dusty brown black lines of 
spores becoming scattered and leaves shredded ; spores usually 
ellipsoidal to spherical, occasionally irregular, prominently echinu- 
late, chiefly 9-14 /x in length. 
Hosts: Agrostis alfra var. vulgaris , Conn., Ia., Ill., Mo.; 
Ammophila arundinacea, Mass.; Elymus Canadensis var. glauci- 
