1893.] NATURAL SCIENCES OF PHILADELPHIA. 155 



swellings on the stems and leaves, are about 5 or f mm. high, erect 

 and deeply fimbriate-lacerate above, the membrane thin and white. 

 Aecidiospores, globose, oblong or irregular in shape, smooth or nearly 

 so, 18-22// in the longer diameter. 



Uromyces macounianus E. & E. 



On Euphorbia sp. (E. maculata affinis), Vancouver Island, 

 British Columbia. Aug., 1887. (Macoun, No. 322.) 



II. III. Sori amphigenous, convex or subhemispherical, surrounded 

 by the ruptured epidermis, mostly crowded, light chestnut color, 

 becoming darker, about 1 mm. diam. Uredospores globose or 

 ovate, echinulate, about 15// diam. Teleutospores globose or ovate- 

 elliptical, pale brown, slightly tuberculo-echinulate especially at the 

 apex which is not thickened and is mostly without any distinct 

 papilla, I-I-I6/1 diam. Pedicels shorter than the spores, hyaline 

 and deciduous. 



Differs from U. euphorbice C. & P., in its smaller, less distinctly 

 roughened spores and crowded, lighter colored sori which often 

 nearly cover one or both sides of the leaf but are not confluent. 



Uromyces sporoboli E. & E. 



On Sporobolus asper Rockport, Kansas. Sept., 1892. (Bartholo- 

 mew, No. 733.) 



III. Sori mostly hypophyllous, black or nearly so, elongated or 

 linear, 1-4 mm. long, soon naked. Teleutospores of variable shape, 

 subglobose, about 20//.. diam., or obovate, 25-30 x 20-22//, or elon- 

 gated-piriform or oblong, 30-40x20-22//, evenly rounded at the 

 apex or oftener with a distinct papilla, epispore smooth, distinctly 

 thickened at the apex, chestnut-brown ; pedicels 70-100// long 

 mostly colored. 



Differs from U. dactylidis Otth. U. peckianus Farlowand U. gram- 

 inicola Burrill in its more robust growth and larger spores, and from 

 the two first mentioned in the absence of paraphyses. 



JEcidium ludwigise E. & E. 



On leaves of Lud wigia sphcerocarpa, Ellendale, Sussex Co., Del. 

 Sept., 1892. (Commons, No. 1,983.) 



Spots amphigenous, purplish-red above, more obscure below 

 scattered or subconfluent, suborbicular, 1-3 mm. diam. Aecidia 

 amphigenous, but more abundant below, either standing singly or 

 oftener collected in a compact cluster forming a little tubercle 1-2 

 mm. diam., as in JEz. myricatum Schw. ; single cups minute (i mm.), 



