192 Bulletin 313 



cial and dark; teleutospores ovate-oblong or clavate, obtuse, con- 

 stricted in the middle, upper cells sometimes long-pointed; epispore 

 thick, at first dirty-yellow in color, at length dark broAvn, at matur- 

 ity quite dark, 28-45 x 12-17 yu., smootli, pedicel elongate about 5 /m 

 thick, cylindrical, persistent, somewhat thickened above." 

 Modified description taken from Sacc. Syll., v. 7, p. 659. 



1013. Portion of infected corn leaf. 1014. Uredospore, 1/12. 

 1015. Teleutospore, 1/12. 



PucciNiA TARAXACi (Ruben) Plowr. — On leaves of dandelion. 

 Described by Sydow as follows : 



"Uredospore sori amphigenous, often on spots, often without 

 spots, scattered, sometimes confluent, minute, rotimd or oblong, pul- 

 verulent, brown, uredospore globose, subglobose or ovate, echinu- 

 late, light brown, 22-27 x 16-24 fx, teleutospore sori similar, about 

 ^-}i mm, in diameter, dark or black-brown, teleutospores ellipsoid 

 or ovate-ellipsoid, apex rotund not thickened, middle of spore not or 

 slightly constricted, base for the most part rotund, delicately verru- 

 cose, brown 25-38 x 16-24 fi, epispore thin, pedicel hyaline, short." 



1016. Infected portion of leaf of Taraxacum taraxacum. 1017. Uredo- 

 spore, 1/12. 



PucciNiA TRiTiciNA Eriks. — On wheat. Described by McAlpine 

 as follows : 



"II. Uredosori 1-2 mm. long, reddish-brown, amphigenous but 

 mostly on upper surface of leaf blade, elliptic, sometimes confluent, 

 scattered or somewhat gregarious, occasionally on sheath and stem." 



"Uredospores subglobose to shortly ellipsoid, echinulate, orange- 

 yellow, 4-6 scattered germ pores on one face, 20-28 x 18-21 /a." 



"II. Teleutosori oblong, black, to dark brown, hypophyllous, 

 scattered, often arranged lengthwise in lines, sometimes on sheath 

 and stem, covered by epidermis, divided into compartments sur- 

 rounded by brown paraphyses." 



"Teleutospores clavate to oblong, smooth, yellowish-brown to 

 dark-brown, slightly constricted at septum, very occasionally 3- 

 celled, 39-57 x 15-18 ^, average 48-16 fi; upper cell deeply colored, 

 generally rounded or flattened at apex and thickened, 17-31 x 15-18 ju.; 

 lower cell paler and attenuated towards pedicel, longer and nar- 

 rower than upper, 22-36 x 12-14 fi; pedicel short, colored." 



"X. Mesospores occasional, similarly colored to teleutospores, 

 ellipsoid to clavate or sub-clavate, shortly stalked, smooth, slightly 



