Arthur: Uredinales of Costa Rica 129 



50. Puccinia canaliculata (Schw.) Farl. (on Cyperaceae) 

 Cyperus ferax L. C. Rich., San Jose, Jan. 8, 191 6, II, 385. 

 Dichromena radicans Schl. & Cham., San Ramon, Jan. 13, 191 6, 

 II, 420. 



A widespread heteroecious rust, usually only producing- ure- 

 dinia in the warmer regions. 



51. Puccinia consobrina Arthur & Hoi way sp. nov. (on 



Cyperaceae) 



Rynchospora polyphylla Vahl, San Ramon, Jan. 14, 191 6, II, III, 

 430. 



II. Uredinia hypophyllous, scattered, oblong, 0.2-0.4 mm. 

 long, soon naked, cinnamon-brown, ruptured epidermis notice- 

 able; urediniospores globoid or ellipsoid, 18-23 by 21-26 fx; wall 

 cinnamon-brown, 1.5-2.5//,, moderately echinulate, the pores 2, 

 equatorial. 



III. Telia hypophyllous, scattered, ellipsoid, small, 0.1-0.2 

 mm. long, soon naked, chestnut-brown, ruptured epidermis in- 

 conspicuous ; teliospores ellipsoid or oblong, 19-23 by 32-37 /x, 

 rounded at both ends, somewhat constricted at septum; wall 

 chestnut-brown, 2-3 /x thick, somewhat thicker above, about 7 *i 

 including a lighter umbo ; pedicel colorless, once to twice length 

 of spore. 



The species differs widely in its ellipsoid teliospores from P. 

 angustatoides Stone, with its cuneate teliospores and occurring 

 on various species of Rynchospora in the southeastern United 

 States and the West Indies. The urediniospores also show dif- 

 ferences in size and position of pores. 



The rust occurs on the same host on a specimen in the phanero- 

 gamic herbarium of the N. Y. Bot. Garden, collected at Content 

 Gap, vicinity of Cinchona, Jamaica, W. L, Sept. 2-10, 1906, II, 

 III, N. L. Britton 33. Another collection from Jamaica has also 

 been found in the cryptogamic collection of the same institution, 

 on R. corymb osa (L.) Britton, road between Port Antonio and 

 St. Margaret's Bay, March 28, 1913, II, L. M. Underwood 17 15. 



52. Puccinia Pallor Arthur & Holway sp. nov. (on 

 Amaryllidaceae) 

 Bomaria sp., Volcan de Irazu, Cartago, Dec. 23, 191 5, II, 287. 



