Arthur: Uredinales of Costa Rica 119 



A common rust throughout the mountainous region of western 

 North America. It has its aecia on twigs and trunks of pine, 

 but they have not yet been taken in Mexico or Central America. 



13. Cronartium Wilsonianum Arth. (on Vitaceae) 

 Cissus rhombifolia Vahl (?), slopes of Irazu above Cartago, 



Dec. 23, 1915, II, 286; Orotina, Dec. 30, 1915, III, 323 : 



same, Dec. 31, 1915, II, 345. 

 A long-cycle rust, heretofore known only from Cuba. The 

 alternate form is still undetected. The specific determination of 

 the host for each of the three collections is very uncertain. 



14. Cionothrix praelonga (Wint.) Arth. (on Carduaceae) 



Eupatorium daleoides (DC.) Hemsl., Trail to Volcan de Poas, 



Jan. 5, 1916, 367; Cartago, Jan. 20, 1916, 4.48a. 

 Eupatorium odoratum L., Orotina, Dec. 30, 191 5, 321. 

 Eupatorium sp., San Jose, Dec. 27, 191 5, 306. 



This short-cycle rust was also detected in the phanerogamic 

 herbarium of the N. Y. Bot. Garden, on E. daleoides Hemsl., 

 Forets du Copey, February 1898, Tonduz 116/ p. 



15. Alveolaria Cordiae Lagerh. (on Ehretiaceae) 

 Cordia ferruginea R. & S., San Ramon, Jan. 13, 191 6, 414. 



A peculiar, short-cycle rust, occurring also in Guatemala and 

 the West Indies, as well as in South America. The host is a new 

 one. 



Family: AECIDIACEAE (Pucctniaceae) 



16. Ravenelia Ingae (P. Henn.) Arth. (on Mimosaceae) 

 Inga leptopoda Benth., San Jose, Jan. 8, 1916, O, II 2 , 389 ; 

 same, Jan. 10, 1916, O, II if 400; Tres Rios near San Jose, 

 Jan. 17, 1916, II 2 , 436. 

 Inga sp., San Jose, Dec. 26, 191 5, O, 11^ 295. 



A common rust on many species of Inga in tropical x\merica, 

 and like all species of the genus doubtless possesses pycnia., 

 uredinia, and telia, although the telia have not yet been seen. 



