Jackson: North American Ustilaginales 151 



On Collinsia grandiflora Dougl. Mary's Peak, Benton Co., 

 May 21, 1915, 3413. 



On Collinsia tenella (Pursh) Piper. Corvallis, Benton Co., 

 April 8, 1914, 1696, April 11, 1915, 3411. 



Urocystis Trillii sp. nov. 



Sori hypophyllous on yellowish spots, subcostal, or caulicolous, 

 round or oval, 0.5-1.5 mm. across, scattered or more commonly 

 gregarious in more or less circular groups 5-10 mm. across, cau- 

 licolous sori often elongated, reaching 1 cm. in length, opening 

 tardily and exposing the purple-black spore mass ; ruptured epi- 

 dermis cinereous and conspicuous ; spore balls chestnut-brown, 

 globoid, 24-50/*, or ellipsoid, 30-40 by 50-70 occasionally 

 smaller ; sterile cells subgloboid or polygonal, 5-9 /x, wall golden- 

 brown, 1-1.5//, thick, collapsing with age; spores subgloboid, 

 ovoid or polyhedral, few to many in a ball, 3-20, rarely only "one 

 or two, mostly 10-15 /x, wall 2-3^ thick, chestnut-brown. 



On Trillium chloro pet alum (Torr.) Howell. N. W. Corvallis, 

 Benton Co., Oregon, April 13, 1912, F. D. Bailey, 1066, May 19, 

 1912, F. D. Bailey, 1094, April 7, 1914, 181 1, April 11, 1915, 3420, 

 May 1, 1915, 3408, May 6, 1919, 3437 (type) ; Mary's River, 

 Benton Co., June, 191 1, 1097. 



Unless otherwise noted the collections were made by the writer. 



This smut is very characteristic and conspicuous. The sori on 

 the leaves are usually grouped together, the individual sori 

 roundish or oval, usually 0.5-1.5 mm. across. On the veins and 

 stems the sori are often confluent and quite large, reaching 1 

 cm. or more in length. With one exception the collections were 

 made in one spot in low, rich land along a stream. The smut 

 appeared in abundance each year. 



Urocystis Ornithogali Koern. ; Fisch. de Waldh. Apercu Syst. 



Ust. 41. 1877 



This species, occurring in Europe on Ornithogalum, has been 

 more commonly referred to U. Colchici (Schlect.) Rab., but is 

 considered distinct by Schellenberg 4 in his recent treatment of the 

 smuts of Switzerland. The writer is inclined to agree with this 



4 Beitrage Krypt. Schweiz 3 2 : 139. 191 1. 



