G2 



Mycologia 



species, having an extraordinary resemblance to Perisporiaceae, 

 like Perodiella." The uredinia are indeed most unusual, both in 

 the form of the spore, and in the ball or basket of paraphyses, 

 which hold together firmly at their bases and easily separate as 

 a whole from the host. The aecia are no less strange in being 

 so deep-seated, and in having spores so closely resembling the 

 urediniospores, even to the sculpturing. The aeciospores come 

 nearest to being echinulate of any known. The teliospores germi- 

 nate upon maturity. 



It is a pleasure to dedicate this genus to Dr. E. W. Olive, of 

 the Brooklyn Botanic Garden, who has done much to make known 

 the nuclear behavior and historical development of the rusts, and 

 whose recent paper in connection with Professor H. H. Whetzel 

 on the short-cycle, aecia-like rusts of Porto Rico, a product of 

 their recent exploration of the island, has been an especially 

 notable achievement. 



The collections at present known to the writer, beside the above 

 by Whetzel and Olive are three recorded in the Stevens Porto 

 Rican list (Mycol. 7: 328-329), two of them from Porto Rico 

 with O, I, II, and one from Tortola with O, I, and two by E. Ule 

 from Brazil, as recorded by Hennings, 1. c. 



-8. Olivea Petitiae sp. nov. 

 On Verbenaceae: 

 Petitia doming ensis Jacq., Maricao, mountains along the 

 Rio Grande river, March 23, II, iii, 349. 



Uredinia hypophyllous, somewhat grouped on indefinite, 

 brownish spots, or scattered, forming globose, chestnut-brown 

 balls, 0.1-0.3 mm - across, seemingly superficial; paraphyses 

 cylindrical, incurved, joined by their bases, forming a globose 

 basket holding the spores, 8-10 by 90-175 /x, the wall dark cin- 

 namon-brown, thick, nearly or quite closing the lumen ; uredinio- 

 spores globoid-obovate, somewhat stellately angular, 24-32 by 

 29-32^; wall cinnamon-brown, about 1.5 /* thick, moderately 

 echinulate, the pores approximately equatorial, usually 4, one at 

 each projecting angle. 



Telia replacing the uredinia in the same sorus ; teliospores 

 clavate or fusiform-clavate, 13-19 by 45-58^; rounded or nar- 

 rowed above; wall uniformly thin, 1 ^ or less, smooth, colorless. 



The gross appearance of this species is like that of Olivea 



