Urocystis trientalis (Berk. & Broome) B. Lindeb. 1959

Tuburcinia trientalis B. & Br. Ann. Mag. Nat. Hist
II. 5 : 464. 1850.
Ascomvces Trientalis Berk. Outl. Brit. Fungi 376. 1860. [Conidial stage.] Sorosporium Trientalis Woronin ; Fisch. de Waldh. Aper^u Syst. Ust. 32. 1877.
Sori on leaves, petioles and stems, variable, often pustular, on stems frequently forming areas of considerable extent, sometimes erumpent ; spore-balls reddish-brown, irregular, oblong to subspherical , firm, usually with little evidence of sterile envelope, composed of 10 to many spores, 45-100 // in length; spores reddish-brown, oblong to polyhedral, smooth, 14-22 ii in length ; conidial stage forming a dense, white, epiphyllous coating usually over entire leaf, with hyaline, thin-walled, oblong to ovate conidia about 11-14 ," X 5-7 /i.
On Primulaceae :
Trientalis arctica {T. europaed)^ Alaska. Type locality : Aberdeen, Scotland, on Trientalis europaea. Distribution : Alaska ; also in Europe.