Part 3, 1912] AEJCIDIACKAB 215 



7. Eriosporangium oaxacanum (Dietel & Holway) Arth. Result. 



Sci. Congr. Bot. Vienne 343. 1906. 



A ectdium fragile Holway, Bot. Gaz. 31 : 331, hyponym. 1901. 

 Puccinia oaxacana Dietel & Holway ; Holway, Bot. Gaz. 31 : 331. 1901. 



O. Pycnia amphigeiious, few in a group, minute, inconspicuous, globoid, 80-100 m broad. 



T. Aecia amphigenous, abundant, in groups of 2-6 crowded about the pycnia, often soli- 

 tary ; peridium cylindrical, 0.1-0.2 mm. in diameter, 0.1-0.3 mm. high, colorless, very deli- 

 cate and evanescent; peridial cells loosely overlapping, 40-65 /i long, angularly oblong-fusi- 

 form in face view, linear in radial section, 6-10 ju across, the outer wall thin, about l/z, 

 smooth, the inner wall somewhat thicker, about2/i, strongly verrucose ; aeciospores ovate- 

 oblong or oblong-fusiform, often acute at one or both ends, 16-25 by 29-40 /i ; wall colorless, 

 uniformly thin, about 1 ju, strongly verrucose with closely set beads. 



II. Uredinia hypoph3dlous, not abundant, scattered, round, very small, 0.1-0.3 mm. 

 across, early naked, pulverulent, light cinnamon -brown, ruptured epidermis barely notice- 

 able ; urediniospores broadly obovoid or globoid, 19-23 by 23-28 ;u ; wall pale cinnamon- 

 brown, thin, 1 |i, minutely and closely echinulate with points about 1.5/:* apart, the pores 

 very obscure, probably more than 2 and scattered. 



III. Telia hypophyllous, numerous, scattered, round, early naked, small, 0.1-0.4 mm. 

 across, pulvinate, dark cinnamon-brown, or cinereous by germination, ruptured epidermis 

 inconspicuous ; teliospores oblong or obovate-oblong, 18-25 by 33-48 m, rounded or obtuse 

 at both ends, often narrowed below, slightly or not constricted at the septimi ; wall smooth, 

 pale yellowish-brown, concolorous, thin, 1-1. 5 ^u, somewhat thickened at apex, 2-4 m ; pedicel 

 nearly or quite colorless, terete, slender, 3-8 /x thick, about once length of spore. 



On Carduaceae : 



Baccharis hirtella DC, Oaxaca. 

 Type locality : Oaxaca, Mexico, on Baccharis hirtella. 

 Distribution : Southeastern Mexico. 



8. Eriosporangium sphenicum Arthur. 



Puccinia sphenica Arth. Bull. Torrey Club 38 : 371. 1911, 



O and I. Pycnia and aecia unknown. 



II. Uredinia chiefly hypophyllous, scattered, round, very small, 0.1-0.3 mm. across, at 

 first pustular, soon naked, light cinnamon-brown, pulverulent, ruptured epidermis notice- 

 able ; urediniospores broadly obovoid, 19-23 by 24-30 /i; wall pale-tawny or nearly color- 

 less, moderately thin, 1.5/^, minutely and rather closely echinulate, the pores not very dis- 

 tinct, 3 or 4, equatorial. 



III. Telia hypophyllous, scattered, small, 0.1-0.3 mm. across, early naked, pulvinate, 

 chestnut-brown, ruptured epidermis inconspicuous; teliospores ellipsoid, 27-32 by 35-45 /i, 

 rounded at both ends, slightly or not constricted at the septum ; wall smooth, chestnut- 

 brown, concolorous, moderately thick, 2.5-4^, thicker at the apex, 4-9 z^; pedicel often 

 inserted obliquely, colorless or somewhat tinted, terete, 6-10 /^ thick, thin-walled, fragile, 

 about once length of spore. 



On Carduaceae : 



Baccharis sordescens DC, Morelos. 

 Type locality : Cuernavaca, Mexico, on Baccharis sordescens. 

 Distribution : Known only from the type locality. 



9. Eriosporangium pistoricum Arthur. 



Puccinia pislorica Arth. Bull. Torrey Club 38 : 372. 1911. 



O and I. Pycnia and aecia unknown. 



II. Uredinia hypophyllous, abundant, scattered, roundish, large, 0.3-0.8 mm. across, 

 soon dehiscent, but long covered partially by the overarching epidermis, light cinnamon- 

 brown, somewhat pulverulent; urediniospores globoid, or obovate-globoid, 24-32 by 30- 

 39^; wall pale-yellowish, or almost colorless, moderately thin, about 2(i, sparsely and 

 strongly echinulate with points about 3/^ apart, the pores small, very indistinct, probably 

 few and scattered. 



