366 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Ustilago Vilfae Wint. 
Ustilago Vilfae Wint., 1 Bull. Torr. Bot. Club, 10: 7. 1883. 
Tilletia subfusca Hume, Proc. Ia. Acad. Sci., 9: 235. 1902. 
Exsiccati : Ustilago Vilfae Wint., on Vilfa vaginaefiora , Ell., N. A. 
Fungi, 1093. 
Sori in the inflorescence, converting it into an elongated dusty 
spore mass, 1-2 cm. in length, at first completely hidden by the 
enveloping leaf sheath; spores dark reddish brown, ovoid or rarely 
oblong to spherical, often slightly angled, more or less prominently 
verruculose, chiefly 12-16 ^t, rarely 19 p, in length. 
Hosts: Sjiorobolus neglectus , Ia. (type Tilletia subfusca ); S. 
vaginaeflorus , Ivans., Penn. (type). 
This species is near Ustilago Habenhorstiana , differing in having 
smaller sori and larger, usually more prominently verruculose spores. 
Norton failed in his effort to germinate the spores. 
Ustilago Habenhorstiana Kuhn. 
Caeoma Syntherismae Schw., N. A. Fungi, 290. 1834. 
Ustilago Habenhorstiana Ktihn, Hedw., 15 : 4. 1876. 
Ustilago destruens var. Digitariae Sacc., Nuo. Giorn. Bot. Ital.,8: 167. 
1876. 
Ustilago Cesatii Fiscli. d. Waldh., Aperc. Syst. Ust., 25. 1877. p. p. 
Ustilago Syntherismae Auct. 2 p. p. [Cke., Grev., 6: 138. 1878]. 
Exsiccati: Ustilago Habenhorstiana Ktihn, on Panicum sanguinale , Ell., 
N. A. Fungi, 287, Seym. & Earle, Econ. Fungi, 63, 63 b (fasc. vm), Rab.- 
Wint.-Paz., Fungi Eur., 4010, Syd., Ust., 164, Seym. & Earle, Econ. Fungi 
Clinton Ust. Supp., C 85; Ustilago Syntherismae Schw., on Panicum 
, sanguinale, Ell. & Ev., N. A. Fungi, 1890 b , on Panicum sp., Rav., Fungi 
Amer., 56. 
Sori usually involving the entire inflorescence, linear-oblong, 3-5 
cm. in length, at first hidden by enveloping leaf sheaths but finally 
more or less visible as a black brown dusty mass of spores surround¬ 
ing the elongated remnants of the inflorescence; spores reddish olive 
brown, ovoid to spherical or occasionally somewhat angled, echinu- 
late or verruculose, usually 10-14 p in length. 
i 
1 Also in Hedw., 22 : 2. 1883. 
2 See synonymy under Sorosporium Syntherismae. This same name was used 
three years earlier by Peck for that fungus. 
