Part 3, 1912] AECIDIACBAB 169 



and a half to twice length of spore, the upper part brownish especially near the spore, 

 9-10 fi in diameter, the lower part hygroscopic, colorless, longer than upper part, in water 

 becoming linear or somewhat oblanceolate, 16-20 ^ in broadest diameter. 



On Rosaceae : 



J?osa acicularis lyindl., Alaska. 



Rosa Engelmanni S. Wats., Minnesota, North Dakota. 



Rosa heliophila Greene {R, arkansana S. Wats, not Porter, R. pratincola Greene), North 

 Dakota, 



Rosa Macdougali Holz., Idaho, Montana. 



Rosa nutkana Presl, Idaho, Montana ; Alaska. 



Rosa Sayi Schw. {R. acicularis Bourgeauiana Cr€pin), Michigan, Minnesota ; Ontario. 

 Type locality : Sordavala, Finland, on Rosa acicularis. 



Distribution : Western Ontario and the northern border of the United States from Michigan 

 to Idaho, northward and westward into Canada, and Alaska; also in northern Russia. 

 ExsicCATi : Sydow, Ured. 2282. 



8. Phragmidium montivagum Arth. Torreya 9 : 24. 1909. 



0. Pycnia amphigenous, gregarious and often confluent, in small groups surrounded 

 by aecia or on spots opposite the aecia, inconspicuous, subcuticular, extending into the 

 lateral walls of the epidermal cells, pale honey-yellow, discoidal, low, 80-112 /£ in diameter 

 by 30-35 /^ high. 



1. Aecia hypophyllous and petiolicolous, 0.4-1.5 mm. across, solitary, or in irregular 

 groups, on petioles andyoung shoots cansingsome hypertrophy and distortion, of ten confluent 

 over areas 5-10 mm. long, applanate, bright orange-yellow fading to pale-yellow, ruptured 

 epidermis usually not conspicuous ; paraphyses abundant, conspicuous, surrounding each 

 individual sorus, somewhat curved, noticeably taller than the spore-mass, spatulate-capitate 

 or clavate, 12-25 by 50-70 /i, the wall evenl}^ thin, 1-1.5 ^, nearly or quite colorless, smooth ; 

 aeciospores globoid or broadl}- ellipsoid, 16-19 by 21-26//, the wall nearly colorless, moderately 

 thin, 1.5-2 //, rather sparsely but distinctly verrucose, the pores indistinct, scattered, about 8. 



II. Uredinia hypophyllous, numerous, scattered, round, small, about 0.1 mm. or less 

 across, soon naked, ruptured epidermis inconspicuous; paraphyses numerous and noticeable, 

 encircling the sorus, incurved, cylindrical or slightly clavate, 9-11 by 45-64 /(, the wall thin, 

 about 1/i, slightly thicker above on outer side of curve, nearly or quite colorless, smooth ; 

 urediniospores obovate-globoid, 16-20 by 18-24 //; wall pale-yellow, moderately thick, 1.5- 

 2//, closely verrucose-echinulate, with points about 2/^ apart, the pores indistinct, scattered, 



6 or more. 



III. Telia hypophyllous, at first arising from the uredinia, numerous, thickly scattered, 



0.1-0.5 mm. across, blackish or blackish-brown, ruptured epidermis inconspicuous ; paraph- 

 yses none; teliospores cylindrical, 24-29 by 64-96//, usually rounded below and narrowed 

 above, 6-9- (usually 8-) celled; wall closely and moderately verrucose, the apex usually with 

 a conical subhyaline apiculus 7-10 ^ long ; pedicel rugose when dry, slightly more than once 

 length of spore, the upper part colorless except near the spore, 7-9// in diameter, the lower 

 part colorless, swelling in water to oblanceolate or narrowly ellipsoid, 15-30// at broadest 



diameter. 



On Rosaceae : 



Rosa aciculaia (Cockerell) Rydb., Colorado. 



Rosa Bakeri Rydb., Colorado. 



Rosa Engelmanni S. Wats., Colorado, South Dakota, Wyoming. 



Rosa Fendleri Cr6pin, Colorado, Montana. 



Rosa grosse-serrata K. Nels., Utah, Wyoming. 



Rosa gymnocarpa^vX\..,yiow\^-^^. 



Rosa gymnocarpa pubesc ens S. Wats., California. 



Rosa Macounii Greene, Colorado, Utah, Wyoming. 



Rosa manca Greene, Colorado. 



Rosa Maximiliani Nees {R. Woodsii S. Wats, not Ivindl.), Colorado, Montana, Wyoming. 



Rosa Sayi Schw., Colorado, Montana, Wyoming. 



Rosa Underwoodii Rydb., Colorado. 



Type locality : Cummings, Albany county, Wyoming, on Rosa Sayi. 



Distribution : Mountains from Colorado to western California and northward in the United 

 States,' nearly to the Canadian boundary, and in the Black Hills of South Dakota. 



BxSICCATI : Clements, Crypt. Form. Colo. 150, 586 ; Earth. Fungi Columb. 2341, 2946; Earth. 

 N. Am. Ured. 114; Garrett, Fungi Utah. 179, 180. 



Illustration: Torreya 9 : 23,/. 5. 



