196 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



frequently confluent, forming large sori, light chocolate-brown, 

 rather early naked; teliospores ellipsoid, 24-35 by 45-70^1, dark 

 chestnut-brown; wall 3.5-4 /x thick, rather coarsely and sparsely 

 verrucose, the apex 10-13 M thick, with a semi-hyaline umbo; 

 pedicel tinted next to the spore, up to 135 m long. 



On Convolvulaceae: 



Exogoniuni arenarium Choisy {Ipomoea arenaria Steud., 



/. Steiideli Millsp.). 

 Type locality: Boca del Riachuelo, Argentina, on Ipomoea 



acuminata {Spegazzini, 1880). 

 Distribution: West Indies; also in South America. 

 ExsicCATi: Barth. X. Am. Ured. 42g. 



Note. — This species is readily separated from the other species 

 of Allodiis occurring on Ipomoea by the uniformly thick- walled 

 aeciospores. 



27. Allodus crassipes (B. & C.) Arth. Result. Sci. Congr. Bot. 



Vienne 345. 1906 

 Puccinia crassipes Berk. & Curt. Grev. 3: 54. 1874. 

 Puccinia Ipomoeae Cooke; Lagerh. Tromso Mus. Aarsheft. 17: 61. 



1895. 

 Dicaeoma crassipes Kuntze, Rev. Gen. 3^: 468. 1898. 

 Dicaeoma Ipomoeae Kuntze, Rev, Gen. 3^: 469. 1898. 



Aecia chiefly hypophyllous, often gregarious over the entire 

 leaf, aeciospores 16-22 by 19-26 /x; wall 1-1.5/1 thick, finely 

 verrucose. 



Telia amphigcnous, surrounding the aecia, gregarious and often 

 confluent to form large sori, early naked, dark chocolate-brown; 

 teliospores broadly ellipsoid, 24-32 by 39-61 ju; wall 3-4 m thick, 

 dark chestnut to chocolate-brown, moderately to sparsely and 

 rather coarsely verrucose, the apex 6-9 /x thick with a broad 

 semi-hyaline umbo; pedicel stout, tinted next to the spore, up to 

 100 /x long. 



On Convolvulaceae: 



Ipomoea cathartica Poir. (/. acuminata (V'ahl) R. & S., 

 Phabartis cathartica Choisy), I. piirga (Wender.) Hayne (/. 

 Jalapa Nutt. & Coxe), /. purpurea (L.) Roth, I. tiliacea (Willd.) 

 Choisy (7. fastigiata Sweet), /. trichocarpa Ell. (/. Carolina 

 Pursh, /. commutata R. & S., 7. caroliniana Pursh), 7. triloba L. 



Type locality: Santee Canal, South Carolina, on Ipomoea tricho- 

 carpa. 



