Part 6, 1921] AECIDIACEAE 439 
Puccinia hemisphaerica Ellis & Ev. N. Am. Fungi 3/44, 1894, 
Dicaeoma minussense Kuntze, Rev. Gen. 33: 469. 1898. 
O. Pycnia amphigenous, numerous, rather gregarious, sometimes covering the greater 
part of the leaf, noticeable, honey-yellow becoming brownish, conic or flattened-globoid, 
100-130 by 65-130 u; ostiolar filaments 20~45 » long; pycniospores numerous. 
I. Aecia amphigenous or caulicolous, very numerous, often clustered along the midrib, 
globoid, hemispheric in surface view, often oval, rather large, 0.3-0.8 mm. in diameter; peri- 
dium absent, but the epidermis arched over and opening by a pore at the center, yellow; 
aeciospores globoid or flattened-globoid, 16-29 by 18-28 »; wall colorless, rather thick, 2~3 », 
finely and closely verrucose. 
II. Uredinia amphigenous, few, scattered, roundish or oval, small, 0.2-0.4 by 0.2-0.6 mm., 
early naked, pulverulent, golden-brown, ruptured epidermis conspicuous; urediniospores 
ellipsoid, 17-25 by 23-27 »; wall cinnamon-brown, rather thin, 1-2 pu, closely and finely echi- 
nulate, the pores 3-6, sometimes indefinite and uncertain, but often 4, 2 above and 2 below the 
equator, alternating. 
III. Telia amphigenous, numerous, scattered on somewhat dark spots, roundish or oval, 
0.2-0.8 by 0.2-1 mm., early naked, pulverulent, chestnut-brown, ruptured epidermis notice- 
able; teliospores ellipsoid, 16-24 by 26-42 u, rounded at both ends, slightly or not constricted 
at septum; wall cinnamon-brown, uniformly thin, 1.5 4, moderately or closely verrucose; 
pedicel colorless, fragile or deciduous; mesospores often present. 
On CICHORIACEAE: ; 
Lactuca canadensis L,., New York. 
Lactuca pulchella (Pursh) DC. (Mulgedium pulchellum G. Don), Colorado, Idaho, Kansas, 
Montana, Nebraska, New Mexico, North Dakota, South Dakota, Utah, Washington, 
Wisconsin, Wyoming; British Columbia, Manitoba. 
TyPE LocaLity: Colorado, on Mulgedium pulchellum. 
DISTRIBUTION: Westward from the Mississippi River and Wisconsin to the Pacific coast, and 
on Long Island on the Atlantic Coast; also in northern Europe. 
ILLUSTRATIONS: Sydow, Monog. Ured. 1: 117, f. 93. 
Exsiccati: Barth. Fungi Columb. 2357, 3662, 3760, 4359; Barth. N. Ara, Ured. 452, 547, 744, 
1251, 1551, 1762, 2041, 2042; Brenckle, Fungi Dak. 62, 62a; Clements, Crypt. Form. Colo. 566; 
Ellis & Ev. Fungi Columb. 752, 1381b, 1654, 2150; Ellis & Ev. N. Am. Fungi 3144; Garrett, Fungi 
Utah. 22, 136; D. Griff. W. Am. Fungi 53, 53a, 372; Sydow, Ured. 1924, 2317. 
268. Dicaeoma (?) proximellum Arthur. 
Uredo proximella Arth. Mycologia 7: 324, 1915. 
Puccinia proximella Arth. Bull. Torrey Club 47: 471. 1920. 
O and I. Pycnia and aecia unknown. 
II. Uredinia chiefly hypophyllous, crowded in groups 2-4 mm. across or scattered, bullate, 
roundish or irregular, large, 0.3-0.9 mm. across, tardily naked, cinnamon-brown, pulverulent, 
ruptured epidermis conspicuous as a partial membranous covering; urediniospores broadly 
ellipsoid, 17-20 by 19-24 yw; wall cinnamon-brown, thin, 1-1.5 », closely and finely echinulate, 
the pores rather indistinct, 4-6, scattered, usually 4. 
III. Telia hypophyllous, scattered, oval or oblong, 0.5-0.8 mm. long, rather tardily 
naked, chocolate-brown, somewhat pulverulent, ruptured epidermis conspicuous, partially 
covering the sorus; teliospores ellipsoid or oblong, sometimes irregularly so, 21-27 by 26-42 nu, 
rounded above and below, slightly constricted at septum; wall dark chestnut-brown, uniformly 
thick, 1.5-2 », moderately and distinctly verrucose, the pore of upper cell usually apical, of 
lower cell in the lower half, sometimes above; pedicel colorless, sometimes laterally displaced. 
On CICHORIACEAE: : ; 
Lactuca intybacea Jacq., Cuba; Porto Rico; St. Domingo. 
‘TypH LocaLity: Sabana Grande, Porto Rico, on Lactuca intybacea. 
DISTRIBUTION: West Indies. 
269. Dicaeoma Crepidis-montanae (Sydow) Arthur. 
idi: idis~ . Bot. Zeits. 51: 29. 1901. 
Pine Hide kava Sit aipaa eae ES Fisch: Beitr. Krypt. Schweiz 22: 212. 1904. 
O. Pycnia amphigenous, gregarious in small groups about 1 mm. across, rather incon- 
spicuous, dark-brown, flattened-globoid or globoid, 98-160 » wide by 96-130 u high; ostiolar 
filaments short, up to about 80 » long, not projecting much beyond the ostiole. 
