24 



Phragmidium montivagum Arthur, n. sp.* 



Pycnia amphigenous, gregarious and often confluent, in small 

 groups surrounded by aecia or on spots opposite the aecia, in- 

 conspicuous, subcuticular, 80—112// in diameter by 30-35// 

 high. 



Aecia hypophyllous and petiolicolous, 0.4-1.5 mm. across, 

 solitary, or in irregular groups, often confluent over areas 5-10 

 mm. long, applanate ; paraphyses abundant, conspicuous, sur- 

 rounding each individual sorus, noticeably taller than the spore- 

 mass, spatulate-capitateorclavate, 12-25 // by 50-70/^., wall evenly 

 thin, I — 1.5// ; aeciospores globoid or broadly ellipsoid, 16— 19// by 

 21—26/^, wall medium thin, 1.5—2//, rather sparsely but distinctly 

 verrucose; 



Uredinia hypophyllous, numerous, scattered, round, small, 

 about 0.1 mm. or less across, soon naked, inconspicuous; para- 

 physes numerous and noticeable, encircling the sorus, cylindrical 

 or slightly clavate, 9— 1 1 [x by 45—64/^, wall thin, about i //, 

 slightly thicker above on outer side of curve ; urediniospores 

 obovate-globoid, 16-19// ^Y 1 9— 2 3 /-/, wall pale yellow, rather 

 thin, 1—1.5/^, closely verrucose-echinulate. 



Telia hypophyllous, at first arising from the uredinia, numer- 

 ous, thickly scattered, o. i-0. 5 mm. across; paraphyses none ; 

 teliospores cylindrical, 24—29// by 64—96//, usually rounded 

 below and narrowed above, cells 6-9, closely and rather moder- 

 ately verrucose, apex usually with a conical subhyaline papilla- 

 y—lOju long ; pedicel rugose when dry, upper half 7-9 // in diam, 

 eter, lower part swelling in water to 15—30/^ at broadest part. 



On Rosa Sayi Schw., Cummins, Albany Co., Wyo., July 26, 

 1895, Aven Nelson i^gg (type), Crow Creek, Albany Co., Wyo., 

 August 12, 1903, Aven Nelson 8gij, Belt Mountains, Mont., 



* Pycniis amphigenis, in greges dispositis, inconspicuis, 80-II2 /< diam., 30-35 fi 

 altis. 



Aeciis hypophyllis vel petiolicolis, 0.4-I.5 mm. latis, saepe confluentibus, ap- 

 planatis ; paraphysibus conspicuis, marginalibus ; aeciosporis subglobosis vel ellip- 

 soideis, 16-19 X 21-26 /z ; episporio subhyalino, 1.^-2 fi crasso, verruculoso. 



Urediniis hypophyllis, numerosis, minutis, rotundatis ; paraphysibus cylindraceis 

 vel clavatis, marginalibus; urediniosporis obovato-globosis, i6-ig yc^ ig-2^ /u ; epi- 

 sporio dilute flavo, 1-1.5 /" crasso, verrucoso-echinulato. 



Teliis hypophyllis, numerosis, sparsis ; teliosporis cylindraceis, 24-29 X 64-96 /u, 

 verrucosis, 5-8-septatis, loculo terminali apiculo conoidco hyalino 7-10 u longo 

 ornato ; pedicello supra 7-9 p, diam., infra incrassato, oblanceolato vel ellipsoideo, 

 15-30 /i late. 



In foliis /losa Sayi, Cummins, Wyoming, Julo 26, 1895, Aven Nelson, I4gg- 



