36 SACCARDO, PECK, TRELEASE 



Kadiak (Trelease, 675) ; Yakutat (Trelease, 674) ; Unalaska (Tre- 

 lease, 676). In the inflorescence of Polygonum viviparum. 



This differs from var. glabra in the part of the host plant in which 

 the spores appear, and from the typical form of the species further in 

 its smoother spores. 



Family UREDINACEJE. 

 Caeoma saxifragarum (De Candolle) Schlechtendal.* 



St. Lawrence Island, Bering Sea (Trelease, 660, on Saxifraga 

 bracteatd), 



Uredo ledicola Peck.* 



Virgin Bay (Trelease, 641) ; Kadiak (Trelease, 642). On Ledum 

 palustre. 



Uredo nootkatensis Trelease, sp. nov.* 



Sori subhemispherical, about .5 mm. in diameter, deep orange, the 

 affected leaf yellowish. Spores globose to shortly obovoid, the rather 

 thin wall colorless, radiately striate and slightly roughened, 28-31 /* ; 

 pedicel colorless, very slender, breaking a short distance from the spore. 



Hot Springs, Baranof Island (Trelease, 668, on leaves of Chamcecy- 

 ■paris nootkatensis), 



Peridermium cerebrum Peck.* 



New Metlakatla (Trelease, 667, on Plnus contorta"). 

 ^cidium ranunculacearum De Candolle.* 



Unalaska (Harrington in 187 1-2 ; Trelease, 663 — both on Anemone 

 richardsonii i Trelease, 662, on Ranunculus), 



Held to be a stage of Uromyces dactylidis, which has not yet been 

 observed as Alaskan. 



^cidium grossulariae De Candolle.* 



Wrangell (Evans, 95) ; Juneau (Trelease, 644) ; Sitka (Trelease, 

 643) ; Yakutat (Saunders, 646; Trelease, 645). On Ribes, 



^cidium fraserae Trelease, sp. nov.* 



Spots yellowish, round or sometimes elongated on the petiole or 

 midvein, measuring 2-5 mm. Spermogonia and aecidia amphigenous 

 but most numerous on the lower surface, the former at length brown ; 

 peridia not crowded, irregularly or subcircinately placed, about .25 

 mm. in diameter, cylindrical, without spreading border; spores poly- 

 gonally subglobose to ellipsoid, nearly smooth, 16-22 //. 



Kadiak (Trelease, 647, 648, 649, on leaves of Frasera), 



