Arthur: Uredinales of Porto Rico 



65 



along the Rio Grande, March 24, O, II, 208, west along 

 highway, March 25, O, II, 205; Mayagiiez, " La Jagua," 

 March 28, O, II, 206 (type). 



Pycnia amphigenous, numerous, in crowded orbicular groups 

 1-3 mm. across, punctiform, dark-brown, subcuticular, depressed- 

 hemispherical. 



Uredinia amphigenous, causing more or less hypertrophy, at 

 first surrounding the pycnia, forming groups or rings 1-6 mm. 

 across, small, crowded and confluent, tardily naked, dark cin- 

 namon-brown, subepidermal, pulverulent, ruptured epidermis 

 conspicuous ; paraphyses none ; urediniospores narrowly obovate, 

 18-24 by 30-40 /a; wall golden-brown, moderately thick 1.5-3/*, 

 thicker above, 3-7 fx, echinulate-verrucose and longitudinally 

 striate, the continuous or beaded striations about 1 /x apart, the 

 pores 3 or 4, equatorial. 



Telia unknown. 



The species differs from R. Ingae by the darker and much 

 larger urediniospores with their prominent striations. A re- 

 examination of collections previously known, shows some tend- 

 ency for a part of the spores on Inga Inicuil from Mexico, the 

 type of Uredo excipulata Syd., to be moderately striate, but in all 

 other cases the characters are uniform as given for R. Ingae. 

 There is, however, a collection from Quito, Ecuador, on Inga 

 pachycarpa, January, 1892, G. Lagerheim, distributed by Prof. 

 Lagerheim under the tentative name, Uromyces Ingae ined., 

 which agrees in every particular with the present species, the 

 spores being large, dark and strongly striate. It may be noted 

 as curious that the previous collections from four localities on 

 the island, all on I. vera, belong to the preceding species, while 

 the four collections by Whetzel and Olive from other but not 

 distant localities, also on /. vera, belong to the new species. 



17. Ravenelia Stevensii Arth. 

 On Mimosaceae: 



Acacia riparia H. B. K., Coamo, April 24, II, 18 r. 



18. Ravenelia siliquae Long, Bot. Gaz. 35: 118. 1903. 

 On Mimosaceae: 



Vachellia Farnesiana (L.) W. & A. {Acacia Farnesiana 

 Willd.), Yauco, March 31, II, 105; Coamo, April 24, 

 II, 196. 



