168 Bulletin 313 



round, small, about 0.1 mm. across, early naked, pulverulent, pale 

 lemon-yellow becoming nearly colorless, ruptured epidermis incon- 

 spicuous ; paraphyses wanting ; urediniospores of primary form ir- 

 regularly ellipsoid or elliptical obovate, 16-20 by 20-27 fi, of second- 

 ary fonn more regularly-obovate, or globose-obovate, and slightly 

 smaller, 15-19 by 17-25 /x,; wall nearly or quite colorless, moderately 

 thin, about 1.5 fi, noticeably and rather closely verrucose-echinulate, 

 points about 1 /* apart, lower and broader in the primary than in the 

 secondary form, the pores small, very indistinct, probably 3 or 4 

 and equatorial. 



"III. Telia hypophyllous, irregularly scattered, irregularly 

 roundish, 0.1-0.5 mm. across, early naked, pulvinate, velvety, yellow- 

 ish or pure white, ruptured epidermis inconspicuous ; teliospores 

 cylindrical or cylindrical-clavate, 18-24 by 85-110 ^, irregularly 

 flattened or coronate above, narrowed below, 5-13 celled usually 

 5-6 celled, each cell 15-24 by 17-40 fx, mostly 20-25 /i, trapezoidal and 

 articulated to the cell above by a projection at one side containing 

 the pore; wall nearly or quite colorless, thin, 1.5-2 /n, the apical cell 

 thicker above, 3-5 fi, the other cells thickened above imiformly or 

 only at the lateral projections, smooth or slightly roughened at apex; 

 pedicel colorless, terete, veiy short, often seemingly wanting." 

 North American Flora, v. 7, p. 186 (1912). 



943. Infected cane of blackberry. 944. Uredospores 1/12. 



Gymnosporangium botryapites (Schw.) Kern. — On Chamce- 

 cy parts thy aides. 



"O. Pycnia epiphyllous, few gregarious, in small groups, 0.7-1.5 

 mm. across, punctiform, honey-yellow becoming blackish, conical, 

 128-190 fji in diameter by 64-112 /x high; ostiolar filaments, 30-65 /a 

 long. 



"I. Aecia hypophyllous, few, usually aggregated in groups of 2-8, 

 rarely solitary, borne in gall-like, pyriform protuberances 1-1.5 mm. 

 in diameter by 64-112 fi high by 1.5-3 mm, cylindrical, 0.3-0.8 mm. 

 in diameter by 2-4 mm. high ; peridium soon becoming finely can- 

 cellate, not dehiscent at apex; peridial cells cylindrical, long and 

 narrow, hypha-like, 9-14 /x in diameter by 145-190 /x long, often ir- 

 regularly bent, the outer, inner, and side walls of equal thickness, 

 about 1.5-2 /x, whole surface smooth; seciospores globoid, small, 

 15-17 by 16-22 /x; wall dark cinnamon-brown, 2.5-3 fx thick, moder- 

 ately verrucose, the pores obscure, numerous, scattered." North 

 American Flora, v. 7, p. 195 (1912). On Amelanchier canadensis. 



