126 



Mycologia 



Pycnia epiphyllous, inconspicuous, subepidermal, globoid, no /a 

 in diameter ; ostiolar filaments present. 



Uredinia amphigenous, gregarious on discolored spots 1-3 mm. 

 in diameter, oval or oblong, 0.2-04 mm. long, early naked, pul- 

 verulent, yellowish-brown, ruptured epidermis conspicuous ; ure- 

 diniospores obovoid or globoid, 23-26 by 26-32 p, ; wall yellowish- 

 or pale cinnamon-brown, thick, 2.5-3.5 fx, moderately and rather 

 coarsely echinulate, the pores 3, approximately equatorial. 



Telia amphigenous, scattered, oval or oblong, 0.2-0.3 mm. long, 

 early naked, white, ruptured epidermis usually inconspicuous ; 

 teliospores oblong-ellipsoid, or fusiform-ellipsoid, 16-18 by 29- 

 35 /x, rounded or somewhat narrowed at both ends ; wall colorless, 

 uniformly very thin, 0.5 fx, smooth ; pedicel colorless, about one 

 half length of spore. 



The pycnia were found sparingly on a specimen collected at 

 Guagas, Ecuador, on Vernonia sp., December 1890, G. Lager- 

 heim. The telia are very inconspicuous, due to their lack of 

 color and early germination in situ. 



41. Uromyces columbianus Mayor (on Carduaceae) 



Melanthera asp era (Jacq.) Steud., Orotina, Dec. 29, 191 5, II, 



iii, 318; San Jose, Jan. 8, 1916, O, I, II, 386. 

 Melanthera sp., Trail to Volcan de Poas, Jan. 5, 1916, I, II, III, 

 371; San Ramon, Jan. 14, 1916, II, 428. 

 A long-cycle rust common on species of Melanthera in tropical 

 America, including the West Indies. 



42. Uromyces bidenticola (P. Henn.) Arth. (on Carduaceae) 

 Bidens tereticaulis antiguensis (Coult.) O. E. Schultz, Volcan 



de Irazu, Jan. 21, 1916, O, II X , 453. 

 Bidens sp., Trail to Volcan de Poas, Jan. 5, 1916, O, 3J0. 



These collections show pycnia and primary uredinia. The 

 status of the name is given in Mycologia 9: 71. 1917. 



43. Uromyces Bidentts Lagerh. (on Carduaceae) 



Bidens sp., San Jose, Jan. 8, 1916, 391 (with some leaves bearing 

 U. bidenticola (P. Henn.) Arth.) 

 This correlated, short-cycle species is frequently associated 

 with the preceding long-cycle species, and has about the same 

 range. 



