Arthur : Uredinales of Porto Rico 6 1 



Telia replacing the uredinia in the basket of paraphyses, numer- 

 ous, free, i-celled, sessile, colorless, cylindraceous, the wall thin, 

 smooth. 



Type species Uredo capituliformis P. Henn. (on Alchornea 

 sp., Brazil, Vie 3060, supplemented by aecia on A. latifolia Sw., 

 Porto Rico, Stevens S437> an d by telia on A. latifolia Sw., Porto 

 Rico, Whetzel & Olive 345). 



7. Olivea capituliformis (P. Henn.) comb. nov. 



Uredo capituliformis P. Henn. Hedw. 34: 97. 1895. 

 Ravenelia capituliformis P. Henn. Hedw. 43 : 160. 1904. 

 On Euphorbiaceae : 



Alchornea latifolia Sw., El Yunque, March 12, O, I, II, 

 III, 345; Naguabo on slope of El Duque, April 19, O, 



i, 346. 



Pycnia epiphyllous, in small groups, mammilliform, honey- 

 yellow, subcuticular but depressing or absorbing the epidermal 

 cells, 80-165 n across by 50-95 /x, high; ostiolar filaments wanting. 



Aecia amphigenous, more abundant above, gregarious on 

 slightly discolored spots 2-5 mm. across, pustular, brown, deep- 

 seated among the palisade cells of the host, ostiolate ; peridium 

 none ; aeciospores obovate, stellately protuberant with one apical 

 and four lateral swellings, 20-24 by 27-35^; wall cinnamon- 

 brown, 1-2 /x thick, closely and strongly echinulate-verrucose with 

 colorless rod-like warts, 2-3 /* long. 



Uredinia chiefly hypophyllous, often opposite the aecia, gregar- 

 ious, forming globose, chestnut-brown balls, 0.1-0.3 mm. across, 

 seated lightly on the leaf surface ; paraphyses cylindrical, in- 

 curved, strong, united at the bases, forming a globose basket, 9-1 1 

 by 75-100 n, the wall dark chestnut-brown, thickened nearly or 

 quite to close the lumen ; urediniospores simulating the aecio- 

 spores, obovate, stellately protuberant with one apical and four 

 lateral swellings, 23-29 by 28-33 f 1 \ wa ^ cinnamon-brown, 1— 1.5 « 

 thick, closely and finely echinulate, the pores obscure. 



Telia replacing the uredinia in the same sorus ; teliospores 

 cylindric or cylindric-clavate, 12-16 by 45-60 ^ rounded above, 

 wall uniformly thin, 1 /x or less, smooth, colorless. 



In the notes appended to the original description of the uredinia 

 of this rust, Hennings (Hedw. 34: 97) speaks of it as "a very 

 wonderful species," and nine years later, again having occasion 

 to record its occurrence in Brazil, calls it " a very remarkable 



