Part 3, 1912] ABCIDIACEAE 173 



Distribution : Northern United States east of the Rocky mountains, on cultivated roses, 

 especially those having small leaflets ; also in Europe and Australia. 

 ExsiCCATi: Barth. Fungi Columb. 25^5. 



Illustrations: Jul. Miill. Rostpilze (Inaug.-Diss.) pi. 1, f. 1-3 ; McAlpine, Rusts Austr, 

 pL I,f.37; pi. 26, f. 229-233. 



13. Phragmidium Andersoni Shear, Bull. Torrey 



Club 29: 453. 1902. 



0. Pycnia not seen. 



1. Aecia hypophyllous, usually scattered singly, round, 0.3-0.4 mm. across, pulvinate, 

 bright-orange fading to pale-yellow, ruptured epidermis not conspicuous ; paraphyses rather 

 few and not conspicuous, surrounding each individual sorus, slightly incurved, scarcely 

 equaling the height of the spore-mass, clavate, 10-18 by 45-64 /^, the wall thin, 1-1.5 fi, usu- 

 ally thicker at apex, 2-3 ^, nearly or quite colorless, smooth ; aeciospores broadly ellipsoid, 

 15-20 by 21-26 /i; wall pale-yellow, moderately thin, 1.5-2^, rather coarsely and closely 

 verrucose with irregular papillae. 



II. XJredinia chiefly hypophyllous, scattered, round, small, 0.1-0.3 mm. across, early 

 naked, ruptured epidermis inconspicuous ; paraphyses encircling the sorus, abundant and 

 conspicuous, strongly incurved, slightly clavate, 6-13 by 45-64^, the wall thin, about 1 /i, 

 slightly thicker on the upper side of curve toward apex, 1.5-2 /z, nearly or quite colorless, 

 smooth; urediniospores globoid or broadly ellipsoid, 16-22 by 19-26 /i; wall pale-yellow, 

 moderately thick, 1.5-2.5 /i, closely and rather finely verrucose. 



III. Telia amphigenous, numerous, scattered, irregular in outline, 0.2-0.5 mm. across, 

 early naked, slightly pulvinate, blacki sh -brown , surrounding epidermis inconspicuous; 

 paraphyses none; teliospores cylindrical, 25-35 by 44-74,", rounded above and below, 3-5- 

 celled ; wall blackish-brown, often nearly opaque, moderately verrucose, the apex usually 

 with a small, blunt, rounded hyaline papilla ; pedicel rugose when dry especially below, 

 about once and a half length of spore, the upper half colorless except near spore, 7-10^ in 

 diameter, the lower part colorless, swelling in water to lanceolate, 15-20// at the broadest 

 diameter. 



On Rosaceae : 



Dasiphora fruiicosa (I/.) Rydb. {^Poientilla fruiicosa ly.), California, Colorado, Iowa, New 

 York, Utah, "Wyoming; Alberta, British Columbia, New Brunswick, Ontario. 

 Type locality : Big Horn Mountains, Wyoming, on Poieniilla fruiicosa. 

 Distribution : New York, Colorado, northern California, and northward in the United States, 

 and across Canada from the Atlantic to the Pacific ; also in Europe. 



ExsiccATi: Clements, Crypt. Form. Colo. 585 ; Barth. Fungi Columb. 25-^2; Barth. N. Am. 

 Ured. 11; D. Griff. W. Am. Fungi Ji9, JiPa ; Sydow, Ured. 1834; Vesterg. Micr. Rar. Sel. 1011. 



14. Phragmidium Jonesii Dietel, Hedwigia 44 : 128. 1905. 



0. Pycnia amphigenous, few, gregarious, inconspicuous, subcuticular, light-yellow, 

 hemispherical, 65-128/^ broad by 25-45 u- high. 



1. Aecia amphigenous, oval, sometimes confluent, 0.3-0.5 mm. broad by 0.8-2 mm. 

 long, bright-yellow fading to pale-yellow, ruptured epidermis usually conspicuous ; paraph- 

 yses few or none ; aeciospores ellipsoid to obovate, 15-18 by 21-26 /i ; wall pale-yellow, 



thin, 1-1.5^, finely verrucose. 



II. Uredinia amphigenous, scattered, orbicular, 0.2-0.5 mm. across, ruptured epider- 

 mis usually not conspicuous ; paraphyses numerous, encircling the sorus, somewhat in- 

 curved, cylindrical to clavate, colorless, 10-13 by 45-60 /i, the wall uniformly thin, 1^; ure- 

 diniospores obovate or ellipsoid, 13-19 by 18-26 /i; wall light-yellow to colorless, 1.5-2^ 

 thick, verrucose-echinulate, the pores several, scattered, usually noticeable. 



III. Telia amphigenous, confluent, of irregular outline, 0.5-0.7 mm. across, ruptured 

 epidermis not conspicuous; teliospores cylindrical, variable, 21-27 by 50-95 //, narrowed some- 

 what above and below, 4-10- (mostly 5-8-) celled, the pores 2 or 3 in each cell, usually 3 ; 

 wall dark chestnut-brown to blackish, 2.5-5 /^ thick, rather coarsely verrucose, less so below, 

 lower cells often smooth, the apex with a subhyaline blunt conical papilla, 3-10 u. ; pedicel 

 about length of spore, 45-100 \i, the upper part colorless except near spore, 7-10^ in diameter, 

 the lower part colorless, swelling in water, 18-35/^ at broadest diameter, cylindrical to clavate. 



