﻿592 Arthur: New species of Uredineae 



spores oblong or ovate-oblong, 13-19 by 28-39 ju, rounded at 

 apex, somewhat narrowed below, slightly constricted at septum; 

 wall cinnamon-brown, thin, i /x, thickened above, 4-7 m, smooth; 

 pedicel tinted, fragile, as long as the spore, or broken off much 



On Dioscorea convolvulacea Schlecht & Cham., Jalapa, Mexico, 

 October 2, 1898, E. W. D. Holway 3115, The host has recently 

 been examined at the Gray Herbarium, where a phanerogamic 

 specimen is deposited. The species differs from the nearly allied 

 D. grandijolia Schlecht, in having much shorter leaves and longer 

 staminate racemes. A number of species of rusts have been 

 described on Dioscorea, and placed under different genera, from 

 each of which the above form appears to be wholly distinct. 



. Dondiae sp. nov. 



II. Uredinia amphigenous; urediniospores broadly ellipsoid, 

 26-29 by 32-39^; wall cinnamon-brown, 1.5^1 thick, finely and 

 closely echinulate, the pores 8, scattered. 



III. TeHa amphigenous, large, 0.4-0.7 mm. across, pulverulent, 

 blackish-brown; teliospores ellipsoid, 32-39 by 42-51 ju, rounded at 

 both ends, not constricted at septum ; wall dark chocolate-brown, 

 uniformly 4-5 ju thick, prominently and coarsely verrucosa; 

 pedicel nearly or quite as long as the spore, colorless or slightly 

 tinted, more or less hygroscopic. 



On Dondia intermedia (S. Wats.) Heller, San Diego, California, 

 April 19, 1882, Marcus E. Jones 3153. The host of this collection 

 has recently (January, 1915) been determined by Mr. Paul C. 

 Standley of the United States National Herbarium. Although 

 collected thirty-three years ago the species does not appear to 

 have been found since. 



Aecidium Farameae sp. nov. 



0. Pycnia epiphyllous, in small groups 1-3 mm. across, or 

 scattered over larger hypertrophied areas, becoming blackish- 

 brown, subepidermal, deep-seated, 144-200 n in diameter; ostiolar 

 filaments short. 



1. Aecia hypophyllous and caulicolous, in circular groups 2-5 

 mm. across, on discolored, slightly thickened spots, or scattered 

 widely on much hyptertrophied and distorted petioles and shoots, 

 low cylindric, small, 0.2-0.3 mm. in diameter; peridium erect, 

 irregularly torn; aeciospores angularly globoid or oblong, 23-26 

 by 26-34 m; wall colorless, 1.5/* thick, much thicker above, 

 7-12 /i, moderately and evenly \ 



