Arthur: Cultures of Uredineae in 1908 249 



I. Aecia chiefly hypophyllous, in annular or often crowded 

 groups 1.5-5 mm - across, cylindrical, 0.4-0.8 mm. high; peridium 

 colorless, margin slightly recurved, finely lacerate, cells rhombic 

 in longitudinal section, 21-29/1, long, walls transversely striate, 

 outer thick, 9-1 2/*, inner somewhat thinner, 5-711, finely verru- 

 cose; aeciospores globoid or broadly ellipsoid, 15-20 by 17-24/x,, 

 wall colorless, thin, 1-1.5^, finely and evenly verrucose. 



On Thalictrum Fendleri Engelm., Gunnison Co., Colo., Sept. 2, 

 1899, E. Bartholomew; Salt Lake Co., Utah, July 12, 1904, A. O. 

 Garrett (Sydow, Ured. 1935; Vestergren, Micr. rar. sel. 1002; 

 and Garrett, Fungi Utah. 76) ; T. occidentale A. Gray, Victor, 

 Idaho, July 11, 1901, E. D. Merrill & E. N. Wilcox 1256; Banff, 

 Alberta, July 24, 1901, and July 6, 1907, E. W. D. Hohvay; T. 

 sparsiflorum Turcz., Ouray, Colo., Sept. 2, 1907, F. D. Kern; 

 Minnehaha, Colo., Aug. 13, 1906, F. E. Clements; T. venulosum 

 Trel., Spicer, Routt Co., Colo., July, 1903, L. N. Goodding; 

 Macdougal Park, Mont., July 31, 1908, M. E. Jones. 



II. Uredinia amphigenous, scattered, oblong or linear-oblong, 

 0.2-0.8 mm. long, rather early naked, somewhat pulverulent, cin- 

 namon-brown, ruptured epidermis conspicuous ; urediniospores 

 very broadly ellipsoid or slightly obovate-ellipsoid, 19-25 by 

 23-29/*; wall light cinnamon-brown, moderately thick, 2-2.5/*, 

 finely echinulate ; pores about 6, scattered. 



III. Telia amphigenous, scattered, oblong or linear-oblong, 

 0.4-1 mm. long by 0.2-0.4 mm. wide, long covered by the epider- 

 mis, dark blackish-brown; teliospores clavate or clavate-oblong, 

 13-19 by 31-61/*, usually truncate or obtuse above, narrowed be- 

 low, slightly or not constricted at the septum ; wall chestnut- 

 brown, paler below, rather thin, 1-1.5/x, thicker at apex, 3-5/*, 

 smooth; pedicel somewhat colored, very short. 



On Br omus Porteri (Coult.) Nash, Ouray, Colo., Sept. 2, 1907, 

 F. D. Kern (type) ; Parley's Canyon, Utah, Aug. 18, 1908, A. O. 

 Garrett 1137; B. Pumpellianus Scribn., Banff, Alberta, Sept. 4 

 and 7, 1907, E. W. D. Hohvay; B. Richardsoni Link, Ouray, 

 Colo., Aug. 23, 1907, E. Bethel. 



7. Puccini a on Agropyron. Two collections of rusted Agropy- 

 ron biflorum, collected Sept. 2, 1907, at Lake Louise, in the Cana- 

 dian Selkirks, were sent by Prof. E. W. D. Holway, with the sug- 

 gestion that one of them be sown on Thalictrum and the other on 

 Aquilegia. One collection failed to germinate, the other was sown 

 April 18 on Aquilegia canadensis and Thalictrum dioicum, with 

 infection only on the first, the leaves of which soon began to show 

 hypertrophy of the tissues, and in six to seven days small yellow, 



