214 NORTH AMERICAN FI.ORA [Vor^UMB 7 



I. Aecia hypophyllous and cauHcolous, when on leaves in orbicular groups surround- 

 ing the pycnia, at first bullate, irregular in form, 0.3-1 mm. in longest diameter, soon 

 dehiscent, orange-colored, fading to pale-fuscous when dry, ruptured epidermis overarching, 

 on stems forming long fissures, 5-15 mm., without producing hypertrophy, pulverulent, 

 distinctly fuscous when dry, old fissures more or less closed ; peridium wanting ; aecio- 

 spores fusiform to globoid, mostly ovate-ellipsoid, rounded below, usually somewhat 

 pointed above or even acute, variable in size, 20-29 by 27-60 )u, usually 22-25 by 30-45 /*; 

 wall slightly tinted or colorless, moderately thick, 2-2.5 ju, slightly if at all thicker above, 

 verrucose with rather thickly set punctate beads, arranged in more or less evident longi- 

 tudinal lines, especially toward the apex. 



II. Uredinia amphigenous, scattered, abundant, roundish, 0.1-0.7 mm. across, at first 

 bullate, soon naked, pulverulent, cinnamon -brown, ruptured epidermis usually overarch- 

 ing; urediniospores broadly ellipsoid or obovoid, 20-27 by 29-45^; wall thin, 1.5-2.5/i, 

 pale cinnamon-brown, finely and closely echinulate, with points l/i or less apart, the pores 

 evident, usually large, scattered, about 6. 



III. Telia chiefly hypophyllous, thickly scattered, round, 0.3-0.8 mm. across, soon 

 naked, pulvinate, pale cinnamon -brown, or cinereous by germination, ruptured epidermis 

 inconspicuous; teliospores oblong, 24-29 by 45-70m, rounded or obtuse at both ends, some- 

 what constricted at the septum; wall pale cinnamon -brown, smooth, thin, about 1.5^, a 

 little thicker above, 2-6 m; pedicel colorless, usually inflated up to 25 m in diameter near the 

 spore, tapering downward, once to twice length of spore, the wall thin, collapsing upon the 

 germination of the spore. 



On Carduaceae : 



Baccharis caerulescens A. Gray, Hidalgo. 



Baccharis gliUinosa Pers., Arizona, New Mexico]; Chihuahua, Michoacan, Oaxaca. 

 Baccharis vimhiea DC, California. 

 Baccharis sp., Jalisco, Mexico (state;. 

 Type locality : Pasadena, California, on Baccharis viminea. 



Distribution : From central California and New Mexico south through Mexico ; also in South 

 America. 



ExsiCCATi : Kllis, N. Am. Fungi 1078 ; Ellis & Ev. N. Am. Fungi 2244; D. Griff. W. Am. 

 Fungi 398. 



6. Eriosporangium exornatum Arthur. 



Puccinia exornata Arth. Bull. Torrey Club 38 : 370. 1911. 



0. Pycnia amphigenous, loosely grouped, punctiform, large, honey-yellow, not espe- 

 cially conspicuous ; globose-flask-shaped, 120-160 ^u in diameter. 



1. Aecia hypophyllous, rather closely seated in orbicular groups surrounding the pycnia, 

 groups 1-3 mm. across on larger discolored, unthickened spots, at first bullate, roundish, 

 0.3-0.5 mm. across, soon dehiscent, orange-colored fading to dirty-white, ruptured epi- 

 dermis overarching, conspicuous; peridium wanting ; aeciospores globoid, 24-27 by 26-32 /i ; 

 wall colorless, thick, 3-5 m, coarsely verrucose with closely set oval beads arranged in longi- 

 tudinal or slightly spiral series. 



II. Uredinia hypophyllous, scattered or somewhat grouped, round, 0.1-0. 2mm. across, 

 soon naked, low, pulverulent, pale cinnamon-brown, ruptured epidermis inconspicuous ; 

 urediniospores globoid or obovate-ellipsoid, 20-24 by 24-30 /^ ; wall thin, 1-1.5 /x, very pale- 

 yellow, finely and sparsely echinulate, the pores indistinct, apparently 3 and approximately 



equatorial. 



III. Telia hypophyllous, resembling uredinia but darker in color, 0.1-0.3 mm. across, 

 soon naked, low, applanate, cinnamon-brown becoming cinereous by germination, ruptured 

 epidermis inconspicuous ; teliospores oblong, 19-24 by 37-48^, rounded at both ends, some- 

 what constricted at the septum ; wall golden-yellow, smooth, thin, 1 /x, slightly thicker above, 

 2-4 M ; pedicel colorless, delicate, terete, 5-9 m in diameter, once to twice length of spore. 



On Carduaceae : 



Baccharis thesioides H.B.K., Guatemala. 

 Type LOCALITY : Guatemala city, Guatemala, on Baccharis thesioides. 

 Distribution : Known only from the type locality. 



