194 Bulletin 313 



"II. Uredinia amphigenous, scattered, roundish, 0.5-0.8 mm. 

 across, rather tardily naked, light cinnamon-browm, ruptured epi- 

 dermis conspicuous ; urediniospores ellipsoid, obovoid, or sometimes 

 almost cuneiform, 15-24 by 24-35 ii, rounded above, often narrowed 

 and rather sparingly echinulate, the pores 4, equatorial.'' 



"III. Telia amphigenous, scattered, roundish, or often irregular, 

 rather tardily naked, light chestnut-brown, ruptured epidermis con- 

 spicuous ; teliospores ellipsoid or obovoid, 17-24 by 23-35 /x, rounded 

 or obtuse above and below, wall cinnamon-brown, 1.5-2 ^ thick, witli 

 a small hyaline papilla at apex, 3-5 {x, smooth ; pedicel hyaline, short, 

 deciduous." North American Flora, v. 7, p. 236 (1912). 



1029. Infected spathe of Arisaema iriphyllum. 1030. Aecidium, 2/3. ;031. 

 Cross-section of leaf showing aecidium, 2/3. 1032. Peridial cell, 1/12. 1033. 

 Aeciospores, 1/12. 



NiGREDO FALLENS (Desmaz.) Arth. — On Trifolium pratense. 



"O. Pycnia and secia uncertain. II. Uredinia chiefly hypophyl- 

 lous, scattered, rather early naked, roundish or oval, 0.3-0.8 mm. in 

 diameter, pulverulent, pale, cinnamon-brown, ruptured epidermis 

 conspicuous; urediniospores broadly ellipsoid or obovate-ellipsoid 

 19-23 by 22-26 fi; wall light cinnamon-brown 1.5-2 /* thick, rather 

 sparsely echinulate, the pores 4-6 scattered." 



"III. Telia chiefly hypophyllous, scattered, rather tardily naked, 

 roundish or oval, 0.3-0.8 mm. in diameter, somewhat pulverulent, 

 dark cinnamon-brown, ruptured epidermis conspicuous ; teliospores 

 broadly ellipsoid or obovoid, 16-20 by 20-27 /x; wall cinnamon- 

 brown, moderately thick, 1.5-2 fx, often with an inconspicuous hya- 

 line papilla over tlie germ-pore, smooth, or more usually with a few 

 irregularly scattered, roundish warts ; pedicel short, hyaline, decidu- 

 ous." North American Flora, v. 7, p. 254 (1912). 



Note: — The aecial stage on red clover was reported at the New 

 York meeting of the American Phytopathological Society, Decem- 

 ber, 1916, by W. H. Davis and A. G. Johnson. 



1034. Infected leaf of Trifolium pratense. 1035. Teleutospores, 1/12. 



NiGREDO PLUMBARiA (Peck.) Arth. — On (Enothera biennis. 



"O. Pycnia chiefly hypophyllous, rather few, loosely scattered, 

 punctiform, honey-yellow becoming brownish, flattened, globoid, 

 128-144 fi in diameter by 82-112 fi high." 



"I. Aecia chiefly hypophyllous, numerous, rather evenly and 

 thickly effused over large areas, often occupying all of the under 



