Arthur: Uredinales of Costa Rica 121 



A common warm-region rust in America. Like other species 

 of the genus, it possesses pycnia, uredinia and telia. 



22. Prospodium Amphilophii (Diet. & Holw.) Arth. (on 

 Bignoniaceae) 



Pithecoctenium muricatum DC, San Jose, Dec. 26, 191 5, II, 

 III, 293B ; Orotina, Dec. 31, 1915, II, III, 334. 

 The species has heretofore been known only from Mexico. 



23. Prospodium tuberculatum (Speg.) Arth. (on Verbenaceae) 

 Lantana Camara L., Cartago, Dec. 22, 191 5, II, 277. 



The species is known in the tropical parts of both North and 

 South America. 



24. Prospodium Lippiae (Speg.) Arth. (on Verbenaceae) 

 Lippia myriocephala Schl. & Cham., road to Volcan de Poas, 



Jan. 5, 1916, II, III, 372. 

 Lippia sp., San Jose, Jan. 3, 1916, II, III, 364 ; San Ramon, Jan. 

 13, 1 91 6, II, 417. 

 The spores in this material are somewhat smaller and less 

 strongly developed than usual. A common species in tropical 

 America. 



25. Sphenospora pallida (Wint.) Diet, (on Smilaceae) 

 Smilax sp., San Jose, Dec. 26, 191 5, II, 291. 



An interesting rust, occurring also in South America, is now 

 first reported for North America. The initial stage is unknown. 



The genus Sphenospora was established by Dietel (Ber. Deut. 

 Bot. Ges. 10: 63. 1892) to include the Diorchidium pallidum 

 Wint. (Grevillea 15: 86. 1887). He speaks of the rust as on 

 Dioscorea, although Winter in his original description, does not 

 mention a name for the host, and neither is one mentioned in the 

 later writings by Dietel (Engler & Prantl, Pfl. Fam. i 1 **: 70. 

 1897) or by Sydow, who calls it Puccinia sphenospora Syd., the 

 host being spoken of as an unknown climbing plant. So far as 

 the writer knows only one collection has heretofore been known, 

 that made near Sao Francisco, Brazil, by Ule 143. The collec- 



