Part 6, 1921] AECIDIACEAE 429 
TYPE LocaLity: North Carolina, on Helianthus mollis. 
_ DISTRIBUTION: United States and adjacant Canada, and southward into Mexico and the West 
Indies; also in Europe. 
Iu.ustrations: Beitr. Krypt. Schweiz 2?: f. 151; McAlpine, Rusts Austr. pl.7, f.56; BE. & P. 
Nat. Pal. 1**: 7, 41A-C; Krypt.-fl. Brand. Pilze 3: f. B87. , . : 
Exsiccatt: Barth. Fungi Columb. 2561, 2562, 2665, 2764, 2765, 2854, 2855, 2856, 3065, 3066, 
3067, 3255, 3355, 3456, 3555, 3556, 3658, 3659, 3660, 3661, 3844, 3942, 3943, 4149, 4265, 4266, 4360, 
4361, 4570, 4571, 4666, 4851, 4963, 4964, 5060, 5061, 5062; Barth. N. Am. Ured. 38, 146, 238 239, 
344, 449, 450, 451, 545, 546, 639, 743, 846, 847, 946, 947, 1051, 1052, 1053, 1054, 1154, 1155, 1156, 
1249, 1250, 1348, 1349, 1448, 1548, 1549, 1550, 1654, 1759, 1760, 1761, 1847, 1848, 1849, 1850,1944, 
1945, 1946, 2043, 2044, 2150, 2151, 2248, 2249, 2250; Brenckle, Fungi Dak. 45, 153, 153a, 366, 416; 
Carleton, Ured. Am. 40, 43; Clements, Crypt. Form. Colo. 565; Ellis & Ev. Fungi Columb. 185, 
1392, 1573, 1574, 1647, 1761, 1853, 1854, 1960, 1961, 1962, 2056, 2057, 2058; Ellis, N. Am. Fungi 
265; Garrett, Fungi Utah. 107, 161; D. Griff. W. Am. Fungi 1, 72, a—c; Kellerm. Ohio Fungi 10, 
11, 30, 107, 129, 153; Seym. & Earle, Econ. Fungi 315, 317, 481, 482a, b; Sydow, Ured. 269, 270, 
1072, 1175, 1247, 2028, 2416, 2521; Thiim. Myc. Univ. 436. 
249. Dicaeoma massale (Arth.) Arthur & Jackson. 
Puccinia massalis Arth. Bull. Torrey Club 46: 119. 1919. 
OQ. Pycnia amphigenous and caulicolous, crowded in irregular groups 2-6 mm. across, 
rather inconspicuous, honey-yellow, globoid or flattened-globoid, 112-120 u broad by 96-112 u 
high; ostiolar filaments 40-65 » long, often agglutinated into a short column. 
I. Aecia amphigenous and caulicolous, crowded in irregular groups 2~10 mm. across on 
the blades, often in irregular confluent groups 6-20 mm. long on the stems, petioles, and veins 
causing distortion of the host, cylindric, 0.5-0.8 mm. in diameter, 0.5—1 mm. high; peridium 
white or pale-yellow, the margin erect, erose or somewhat lacerate; peridial cells rhombic, 
19-27 by 32-45 yu, overlapping by a downward projection of outer wall, the outer wall 7-10» 
thick, smooth, transversely striate, the inner wall 5-10, closely tuberculate; aeciospores 
ellipsoid, 16-18 by 22-27 uw; wall colorless, 1.5-2 4 thick, very closely and inconspicuously 
verrucose, 
II. Uredinia amphigenous, scattered, round, 0.8-1.2 mm. in diameter, early naked, pul- 
verulent, cinnamon-brown, ruptured epidermis conspicuous; urediniospores irregularly ellip- 
soid, obovoid, or oblong, 18-24 by 27~35 4; wall light cinnamon-brown, 1—1.5 « thick, moderately 
echinulate, the pores 2, equatorial. 
III. Telia amphigenous and caulicolous, scattered or somewhat grouped, round or oblong, 
0.8-10 mm. long, early naked, pulvinate, chocolate-brown, ruptured epidermis inconspicuous; 
teliospores ellipsoid, 23-32 by 39-48 uw, rounded above and below, slightly or not constricted 
at septum; wall dark chestnut-brown, thick, 3-5 uv, thickened and lighter-colored over pores, 
9-10 uw, smooth, the pore of upper cell apical, of lower cell usually half way to hilum or occa- 
sionally at septum; pedicel colorless, up to 150 » long. 
On CARDUACEAE: 
Helianthus ciliaris DC., New Mexico, Texas. 
TyPE LOCALITY: Brazito, New Mexico, on Helianthus ciliaris. 
DISTRIBUTION: New Mexico and Texas. 
250. Dicaeoma Helianthellae (Peck) Arth. Résult. 
Sci. Congr. Bot. Vienne 344. 1906. 
Trichobasis Helianthellae Peck, Bot. Gaz. 7:45. 1882. 
Aecidium Helianthellae Arth. Bull. N. Y. Bot. Gard. 2: 348. 1902. 
Puccinia Helianthellae Arth. Bull. Torrey Club 31:4. 1904, 
O. Pycnia epiphyllous, crowded in small groups opposite the aecia, punctiform, brownish- 
yellow, immersed, globoid or depressed-globoid, 80-130 broad by 60-804 high; ostiolar 
filaments 45-60 uw long. 
I. Aecia hypophyllous, on discolored spots, crowded in circular groups 2-7 mm. across; 
peridium erect, cylindric, at first erose, becoming coarsely lacerate; peridial cells rhomboidal, 
14-18 by 28-36 u, overlapping, the outer wall striate, 7-9 » thick, the inner wall verrucose, 
3.5-4.5 w thick; aeciospores globoid, 16-20 by 16-22 u; wall colorless, medium thick, 1.5-2 p, 
minutely and closely granulose, usually appearing smooth. 
II. Uredinia hypophyllous, becoming amphigenous, scattered or gregarious, round, 0.2- 
0.8 mm. across, often confluent and then much larger, to 1.5 mm., soon naked, pulverulent, 
