Jackson: New Rusts on Carduaceae 117 



Puccinia Zinniae Sydow, Monog. Ured. 1 : 188. 1902. 

 Puccinia Diaziana Arth. Bot. Gaz. 40 : 203. 1905. 

 Puccinia Tridacis Arth. Bull. Torrey Club 33: 516. 1906. 

 Dasyspora Syncdrellac Arth. Result Sci. Congr. Bot. Vienne 347. 

 1906. 



Puccinia Eleuther anther ae Dietel, Ann. Myc. 7 : 354. 1909. 

 Puccinia Tetranthi Sydow, Ann. Myc. 17 : 33. 1919. 

 Micro puccinia Synedrellae Arth. & Jackson ; Arth. Bull. Torrey 

 Club 48 : 41. 192 1. 



On Carduaceae [Heliantheae] : 

 Hosts as above. 



Type locality : Cuernavaca, Mexico, on M clamp odium [di- 

 varicatum] . 



Distribution : Central Texas to Panama and the West Indies ; 

 also in South America. 



Puccinia solida B. & C. is based on a collection by Charles 

 Wright, 1856-1857, in ■•" Cuba Orientale " on an unknown com- 

 posite, now interpreted as Eleuther anther a ruder alls. Dkacoma 

 cubense is based on the same collection. 



It is very probable that there are other forms in South America 

 and possibly in similar regions in other parts of the world which 

 should be included here. It has, however, been impossible, up to 

 the present time, to bring together all the material which would be 

 needed in making such a comprehensive study, and it should be 

 recognized that the treatment as outlined above is tentative only. 



Puccinia Flaveriae sp. nov. 

 O. Pycnia unknown, probably not formed. 



III. Telia amphigenous or caulicolous, gregarious on discolored 

 spots, or extending for considerable distances on stems, round, 

 small, 0.2-0.5 mm. in diameter, tardily naked, chestnut-brown, pul- 

 vinate, the caulicolous sori long covered by the cinereous epidermis, 

 ruptured epidermis of foliicolous sori conspicuous ; teliospores 

 irregularly ellipsoid, clavate or cylindric, 15-19 by 32-50^, often 

 bent to one side, rounded, obtuse or more or less acute above, 

 rounded or narrowed below, not constricted at septum ; wall light 

 cinnamon-brown, 1.5-2 /x thick, much thicker above, 5-10 fi, 

 smooth; pedicel one half length of spore or shorter, firm, con- 

 colorous with base of spore. 



