Arthur : New species of Uredineae 521 



W. D. Holway. A very conspicuous aecium on account of its 

 long peridium, and the large, dark-colored spores. 



Aecidium Sorbi sp. nov. 



0. Pycnia epiphyllous, numerous, gregarious, in small groups 

 on discolored areas, noticeable, subepidermal, honey-yellow be- 

 coming brownish, conoidal, 1 10-130/i in diameter, 70-80 ji high ; 

 ostiolar filaments 30-45 /i long. 



1. Aecia hypophyllous, numerous, gregarious, in small groups 

 of 4 to 7, arising from slight swellings on discolored spots, or often 

 more numerous on larger swellings on the veins or rachis, cupulate, 

 0.2-0.4 mm. high by 0.2-0.3 mm. across; peridium colorless, 

 margin nearly erect, erose, peridial cells rhomboidal, 30-45 [x 

 long, slightly overlapping, lumen small, outer wall much thickened, 

 10-13 //, transversely striate, smooth, inner wall thinner, 3-5 /*, 

 somewhat striate, moderately verrucose ; aeciospores broadly 

 ellipsoid, usually somewhat angular, 23-27 by 27-39 ft wa ^ color- 

 less, thick, 3-4/*, minutely verrucose. 



On Sorbus Occident alls (Wats.) Greene, Hodag Lake, Van- 

 couver Island, British Columbia, Canada, August 8, 1905, F. K. 

 Butters ; communicated by E. W. D. Holway. A very distinct 

 species of Aecidium, and especially interesting as it is the second 

 one so far known on a pomaceous host. 



Aecidium pulverulentum sp. nov. 



0. Pycnia epiphyllous, numerous, gregarious, in rather small 

 indeterminate groups, not crowded, conspicuous, punctiform, sub- 

 cuticular, becoming blackish-brown, hemispherical, 80-140 /1 in 

 diameter, 40-5 O {x high; without ostiolar filaments; pycniospores 

 numerous above a flat hymenium. 



1. Aecia hypophyllous, numerous in indefinite groups, not 

 much crowded, cylindrical, deep-seated, small, about o. 1 mm. in 

 diameter, pulverulent; peridium colorless, evanescent, peridial 

 cells rather thin, 30-45/^ long, overlapping, easily separating, 

 outer wall smooth, inner wall rather coarsely verrucose ; aecio- 

 spores angularly globoid or ellipsoid, or elongate-polyhedral, some- 

 times broader above, 23-29 by 24-32 a, wall light cinnamon-brown 

 fading to almost colorless, thick, 3-5 /;, much thicker above, 

 7-13 /i, noticeably and strongly verrucose. 



On Randia sp. y Cuernavaca, State of Morelos, Mexico, October 

 SO, 1903, R IV. D. Holway 3275 (type); Chapala, State of 



