Part 3, 1912] AECIDIACEAK 185 



Teliospores many- (5-13-) celled, apedicellate. 

 Cells adhering in free chains. 



Secondary uredinia without paraphyses. 3. K, Uredims, 



Secondary *uredinia with paraphyses. 4. K. malvicola. 



Cells readily falling apart, chains adpressed. 5. K. Gossypii. 



1. Kuehneola obtusa (Strauss) Arthur. 



Uredo obtusa Strauss, Ann. Wett. Ges. 2 : 107. 1810 

 Aregma obtusata Fries, Obs. Myc. 1 : 225, in part. 1815. 

 Puccima Potenhllae Schw. Trans. Am. Phil. Soc II. 4: 297. 1832. 

 Phragmtdium Tormeniillae Fuckel, Symb. Myc. 46. 1869. 

 Aregma triarticulahim Beik. & Curt.; Berk. GrevilleaS: 51. 1874. 

 Fhragmtdium triarticulatum Farl. Bull. Bussey Inst. 1 : 433. 1876. 



Phragmtdium obtusum Wint. in Rab. Krypt. Fl. V~\ 229. 1881. Not P. obtusum Schmidt & 

 Kunze, 1816. 



Phragmtdium PotentiUae<anadensis Dietel, Hedwigia Beibl. 42 : 179. 1903. 

 Kuehneola PoLeniillae Arth. Result. Sci. Congr. Bot. Vienne 342. 1906. 

 Kuehneola Tormeyiiillae Arth. Result. Sci. Congr. Bot. Vienne 342. 1906. 



O. Pycnia epiphyllous, in small crowded groups 0.1-0.4 mm. across, on slightly larger 

 reddened and somewhat hypertrophied spots, inconspicuous, in section globoid-lenticular, 

 112-160 ^ broad by 35-50 ^ high. 



II. Uredinia at first epiphyllous, surrounding the pycnia, in crowded groups 0.5-1.3 

 mm, across, roundish or irregular, often confluent into rings, at first bullate, soon naked, 

 somewhat waxy; uredinia afterward hypophyllous, scattered irregularly, round, 0.2-0.5 

 mm. across, early naked, slightly pulvinate, pulverulent, orange-yellow, fading to dirty- 

 white, ruptured epidermis noticeable ; paraphyses usually wanting ; urediniospores obovate 

 or ellipsoid, 15-18 by 19-26 /i; wall pale-yellow, nearly colorless, thin, 1-1.5 ,", finely verru- 

 cose-echinulate, points 1-2^ apart, the pores small, inconspicuous, 3 or 4, equatorial. 



III. Telia hypophyllous, scattered, round, 0.2-0.5 mm. across, early naked, pulvinate, 

 velvety, cinnamon-brown, ruptured epidermis inconspicuous ; teliospores cylindrical-clavate, 

 or clavate-lanceolate, 20-27 by 48-90 ^, rounded or obtuse above, obtuse or narrowed below, 

 slightly or not constricted at the septa, 3-5-celled ; wall cinnamon-brown, paler below, 

 thin, 1-2 /i, thicker at apex, 5-8//, smooth; pedicel colorless, or tinted next to the spore, 

 terete, 7-10 /^ in diameter, firm, with thick wall, one half to once length of spore. 



On Rosaceae : 



Potenhlla canadensis 'Lt., Connecticut, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, 

 Massachusetts, Michigan, Missouri, New York, North Carolina, Ohio, Pennsylvania, 

 Rhode Island, South Carolina, Virginia, West Virginia, Wisconsin ; Nova Scotia, 

 Ontario. 

 Type locality: Kurope, on Torm-eniilla erecta. 



Distribution : South Carolina to Kansas and northward into Canada ; also in Europe. 

 Illustration : Beitr. Krypt. Schweiz 2^ : /. 288. 



KxsicCATi: Ellis, N. Am. Fungi 283,284; Earth. Fungi Columb. 2543,3240; Earth. N. Am. 

 Ured. 109; Thiim. Myc. Univ. 1445, 1735 ; Vesterg. Micr. Rar, Sel. 634; Kellerm. Ohio Fungi 87 ; 

 Roum. Fungi Sel. 5017. 



2. Kuehneola Duchesneae Arthur, sp. nov. 



O. pycnia chiefly epiphyllous, in small crowded groups, often confluent, inconspicuous, 

 indefinitely mammilloid, often extending between and obliterating the epidermal cells, 



90-130// broad by 50-55 // high. 



II. Uredinia at first (primary) amphigenous and surrounding the pycnia» soon (secon- 

 dary) quite hypophyllous and scattered, round, 0.3-0.8 mm. across, early naked, slightly 

 pulvinate, pulverulent, yellow becoming pale, ruptured epidermis noticeable ; paraphyses 

 with secondary uredinia few, peripheral, not reaching above the spore-mass, cylindrical, 

 nearly or quite erect, 8-12 by 40-50 fi, the wall uniformly thin, 1 // or less, colorless, smooth ; 

 urediniospores broadly ellipsoid or globoid, 14-17 by 16-23^; wall nearly or quite colorless, 

 thin, 1/i or less, minutely and closely echinulate, points 1-1. S fJ- apart, the pores small, in- 

 conspicuous, 3, equatorial. 



III. Telia hypophyllous, scattered, round, 0.2-0.5 mm. across, early naked, pulvinate, 

 velvety, cinnamon-brown, ruptured epidermis inconspicuous ; teliospores cylindrical-clavate 

 or clavate-lanceolate, 19-26 by 50-80 //, rounded or obtuse above, obtuse or narrowed 

 below, slightly or not constricted at septa, 3-5-celled ; wall cinnamon-brown, paler below, 



