90 



Mycologia 



appears to be absent from the Brazilian form, at least it is not 

 mentioned in the original description, and could not be seen in 

 the material at hand (Ule, 2005). About the same differences 

 also maintain between the Porto Rican material and the descrip- 

 tion of the uredinia of Cronartium Byrsonimatis P. Henn., which 

 was collected in Brazil by Puttemans on Byrsonima coccolobifolia, 

 of which I have seen no specimen. The resemblance, however, 

 is sufficiently good to indicate that the present form probably 

 belongs to Cronartium. 



99. Uredo Trichiliae sp. nov. 

 On Meliaceae: 



Trichilia pallida Sw., Maricao, along Rio Grande, March 

 24, 63. 



Uredinia caulicolous, on etiolated shoots, or on midrib and 

 veins, oblong or linear, 0.5-3.5 mm. long, numerous, subepidermal, 

 soon naked, pulverulent, bright yellow, ruptured epidermis evi- 

 dent ; peridium and paraphyses none ; urediniospores borne singly 

 on pedicels, obovoid or ellipsoid, small, 13-15 by 16-23 /x; wall 

 colorless or nearly so, thin, 1-1.5/x, closely and finely echinulate, 

 the pores obscure. 



A rust of unusual appearance, whose affinities are not evident. 

 The form of the sorus and character of the spores suggest 

 Kuehneola more than they do Puccinia or Uromyces. No pycnia 

 or telia could be found. The effect upon the host is similar to 

 that produced by many aecia. 



100. Uredo jatrophicola Arth. 

 On Euphorbiaceae : 



Jatropha gossypifolia L., Yauco, March 31, 241 ; Tanama 

 River Valley, April 7, 240; Rio Piedras, April 10, 239. 

 The paraphyses in this species are sometimes poorly developed, 

 and in the usual free-hand sections may appear to be and possibly 

 are absent. Usually, however, they form a strong pseudoperi- 

 dium, although individually small. In these respects they behave 

 like the similar paraphysoid structure in the uredinia of the 

 common Ficus rust. 



