884 NORTH AMERICAN FLORA [VoLUME 7 
On PoLYGoNACcEAE: 
Bistorta bistortoides (Pursh) Small (Polygonum bistortoides Pursh), Arizona, California, Colo- 
rado, Idaho, Montana, Washington, Wyoming. 
Polygonum Newberryi Small, Oregon, Washington. 
Polygonum spergulariaeforme Meissn. (P. coarctatum Dougl.), California. 
Polygonum Watsonii Small (P. imbricatum Nutt.), Oregon. 
‘TYPE LOcALIty: Ardennes, France, on ‘“‘renoué bistorte” [Polygonum Bistorta]. 
DistRiBuTION: Cool habitats in the Rocky Mountains from central Arizona to southeastern 
Alaska; also in Europe. . 
Inusrrations: Beitr. Krypt. Schweiz. 22: f. 75; Holway, N. Am. Ured. 1: pl. 12, f. 53a, 6; 
Krypt.-fl. Brand. Pilze 3: f. B20; Corda, Ic. Fung. 4: ol. 5, f. 61. 
Exsiccati: Barth. Fungi Columb. 4954; Barth. N. Am. Ured. 224, 532, 1336; Clements, Crypt. 
Form. Colo, 134; Ellis & Ev. N. Am. Fungi 3568; Sydow, Ured. 1814. 
165. Dicaeoma amphispilusum (Dietel & Holway) Arthur. 
Puccinia amphispilusa Dietel & Holway; Dietel, Erythea 3:79. 1895. 
Oand I. Pycnia and aecia unknown. 
II. Uredinia amphigenous, scattered or circinating, small, round, about 0.5 mm. in diam- 
eter, pulverulent, cinnamon-brown; urediniospores broadly ellipsoid, 20-24 by 24-28 u; 
wall light golden-brown, moderately thick, 1.5-2 4, finely and moderately echinulate, the 
pores indistinct, 4 or 5, scattered. 
III. Telia amphigenous, scattered or circinating, round, 0.5-1 mm. in diameter, only 
slightly pulverulent, chocolate-brown, ruptured epidermis rather inconspicuous; teliospores 
oblong or ellipsoid, often somewhat angular and irregular, 18-23 by 27-39 », usually rounded 
at both ends, slightly or not constricted at septum; wall chestnut-brown, 1.5-2 u thick, thick- 
ened over the germ-pores into a small colorless papilla, 3-5 u, smooth except for a few faint 
longitudinal striae; pedicel colorless, short, very fragile. 
On POLYGONACEAE: 
Polygonum Davisiae Brewer, California. 
Polygonum Newberryi Small, California. 
TYPE LOCALITY: Lassen County, California, on Polygonum [Newberryi]. 
DIistRIBuTION: Mountains of northern California. 
ILLUSTRATIONS: Holway, N. Am. Ured. 1: ol. 13, f. 54a, 6. 
166. Dicaeoma Sommerfeltii (Johans.) Arthur. 
Caeoma Thalictri Sommerf. Suppl. Fl. Lapp. 230. 1826. Not Dicaeoma Thalictri Kuntze, 1898. 
Aecidium Sommerfeltii Johans. Oefv. Sv. Vet.-Akad. Férh. 419: 161. 1885. 
Puccinia septenirionalis Juel, Oefv. Sv. Vet.-Akad. Férh. 52: 383. 1895. 
Dicaeoma septenirionalis Kuntze, Rev. Gen. 33: 470. 1898. 
O. Pycnia amphigenous, few, widely scattered, globoid, 120-135 u in diameter; ostiolar 
filaments short. 
I. Aecia amphigenous, in rather crowded irregular groups on blackened spots, cupulate, 
small, 0.2-0.3 mm. in diameter; peridium colorless, fragile, the margin finely erose; peridial 
cells rhombic in radial longitudinal section, 16~23 by 30-38 x, both walls finely verrucose, the 
outer usually thicker, 5—8 yu, the inner 4-7 u; aeciospores globoid or ellipsoid, 15-17 by 17-22 u; 
wall colorless, thin, about 1 4, nearly smooth. 
ON RANUNCULACEAE: 
Thalictrum alpinum I,., Alaska. 
II. Uredinia hypophyllous, scattered, round, about 0.5 mm. in diameter, early naked, 
cinnamon-brown, pulverulent; urediniospores globoid or broadly ellipsoid, 19-21 by 23-26 nu; 
wall dark cinnamon-brown, 1.5—-2.5 w thick, finely and rather closely echinulate, the pores 
rather indistinct, 2-4, equatorial or slightly superequatorial. 
III. Telia hypophyllous, scattered, circular, 0.5—-1 mm. in diameter, early naked, dark 
chestnut-brown, pulverulent; teliospores ellipsoid, sometimes irregular, 15-23 by 26-40 n, 
usually narrowed at both ends, slightly constricted at septum; wall cinnamon- or light chest- 
nut-brown, 1.5-2 4 thick, not thickened at apex except for a prominent hyaline papilla 
4-5 » high over the germ-pore, smooth or with a few faint longitudinal striae; pedicel color- 
less, short, fragile. 
On POLYGONACEAE? 
Bistorta viviparum (L,.) S. F. Gray (Polygonum viviparum L.), Alaska; Newfoundland. 
TYPE LocaLity: Northland, Sweden, on Thalictrum alpinum. 
DistTrisution: Boreal stations in Newfoundland and Alaska; also in Europe. 
ILLUSTRATIONS: Beitr. Krypt. Schweiz 2?: f. 66; Holway, N. Am. Ured. 1: pl. 14, f. 56c; Oefv. 
Sv. Vet.-Akad. Foérh. 41: pl. 29, f. 4, 52: 383, f. la-c. 
