Part 5, 1920] AECIDIACEAE 383 
central pore; peridium fragile, soon disappearing; peridial cells oblong, often collapsed, only 
slightly differentiated from the spores, 13-19 by 30-34 », abutted, the outer wall 3-4 » thick, 
smooth or nearly so, transversely striate, the inner wall slightly thinner, 2-3 », finely and 
closely verrucose; aeciospores ellipsoid, 16-24 by 23-28 u»; wall colorless, moderately thick, 
2-3 p, finely and closely verrucose. 
On AMMIACEAE: 
Ligusticum apiifolium (Nutt.) A. Gray, Washington. 
II. Uredinia hypophyllous, scattered or in groups, round, about 0.5 mm. in diameter, 
soon naked, golden-brown, pulverulent, ruptured epidermis evident; urediniospores globoid 
or ellipsoid, 18-23 by 22-26 4; wall pale-yellow or golden, moderately thick, 1.5—2.5 y, finely 
and moderately echinulate, the pores about 6, scattered or seemingly in two extra-equatorial 
zones. 
III. Telia hypophyllous, numerous, scattered, round, 0.5-1 mm. in diameter, pulveru- 
lent, dark chestnut-brown, ruptured epidermis evident; teliospores broadly ellipsoid or oblong, 
15-19 by 20-28 nu, rounded at both ends, slightly or not constricted at septum; wall cinnamon- 
or chestnut-brown, thin, 1—1.5 u, not thickened at apex, finely verrucose in a few longitudinal 
lines, the pores often seen, apical in the upper cell, variously located in the lower; pedicel color- 
less, fragile, short. 
On POLYGONACEAE: 
Bistorta bistortoides (Pursh) Small (Polygonum bistortoides Pursh), California, Colorado, 
New Mexico, Oregon, Washington, Wyoming. 
Bisiorta vivipara (L.) S. F. Gray (Polygonum viviparum I,.), Alaska, Colorado, New 
Hampshire, Wyoming; Alberta, Ontario. 
TYPE LOCALITY: Lapland, on Polygonum viviparum. 
Distrisution: Alpine stations in the Rocky Mountains from Southern California and New 
Mexico northward to Alberta, and from the White Mountains in New Hampshire northward to the 
Arctic Circle; also in Europe. 
ILLUSTRATIONS: Beitr. Krypt. Schweiz 22: f. 76; Holway, N. Am. Ured. 1: 1, 12, f. 53c. 
Exsiccati: Barth. Fungi Columb. 2349; Barth. N. Am. Ured. 126. 
164. Dicaeoma Bistortae (DC.) Kuntze, Rev. Gen. 
33: 468. 1898. 
Uredo Polygoni Bistortae Strauss, Ann. Wett. Ges. 2: 103. 1810. 
Puccinia Bistortae DC. Fl. Fr. 6:61. 1815. 
Puccinia Cari-Bistortae Kleb. Zeits. Pflanzenkr. 8:27. 1898. 
Puccinia Angelicae-Bistortae Kleb. Zeits. Pflanzenkr. 12: 142. 1902. 
Puccinia Conopodii-Bistortae Kieb. Wirtsw. Rostp. 318. 1903. 
Puccinia Astrantiae-vivipari Semad. Centr. Bakt. II. Abth. 46: 452. 1916. 
Puccinia Pimpinellae-Bistoriae Semad. Centr. Bakt. II. Abth. 46: 454. ' 1916. 
O. Pycnia amphigenous, crowded in small groups 1~2 mm. in diameter, noticeable, honey- 
yellow becoming light-brown, globoid or flattened-globoid, 128-160 » wide by 112-128 y high; 
ostiolar filaments up to 50 » long, usually not projecting much beyond the ostiole. 
I. Aecia hypophyllous, crowded in groups 3~4 mm. in diameter, hemispheric, 0.3-0.7 
mm. in diameter, covered by the persistent epidermis, finally opening by a pore; peridium 
fragile, not projecting beyond the epidermis; peridial cells oblong, somewhat convex, 9-13 by 
29-37 p, abutted, the outer wall about 4» thick, transversely striate, the inner wall thinner, 
2~3 yu, closely verrucose; aeciospores ellipsoid or globoid, 19-24 by 24-29 y; wall colorless, thick, 
2-3 u, closely and finely verrucose. 
On AMMIACEAE: 
Coelopleurum Gmelini (DC.) Ledeb., Alaska. 
II. Uredinia hypophyllous, scattered, round, small, about 0.5 mm. in diameter, early 
naked, golden-brown, pulverulent, ruptured epidermis not apparent; urediniospores globoid or 
broadly ellipsoid, 19-24 by 23-26; wall golden- or cinnamon-brown, moderately thick, 
1.5-2.5 y, finely and moderately echinulate, the pores about 6, scattered, indistinct. 
III. Telia mostly hypophyllous, scattered, round, 0.5-1 mm. in diameter, early naked’ 
pulverulent, dark chestnut-brown, ruptured epidermis not apparent; teliospores oblong or 
ellipsoid, often irregular, 16-21 by 24-35 », rounded at both ends, slightly or not constricted ta 
septum; wall chestnut-brown, moderately thin, 1.5-2 4, not thickened at apex, finely verrucose 
in a few longitudinal lines, the pore apical in upper cell, variously located in the lower; pedicel 
fragile, very short, colorless. 
