Uredinopsis phegopteridis Arthur 1907

Uredinopsis phegopteridis Arthur, sp. nov
Aecfa unknown
Uredinia hypophyllous, scattered on discolored areas bounded by the veins, roundish, bullate, very small, 0.1 mm. across or less, brownish-yellow, dehiscent by apical rupture; peridium delicate; urediniospores ovoid or fusiform, 10-16 by 29-58//, acute or acuminate, prolonged into a very long and slender, sharp-pointed beak, 12-26// long; wall colorless, thin, 1/*, smooth except the two longitudinal lines of closely set, minute papillae,
scarcely visible even when dry.
Teliospores numerous in the mesophyl, 2^-celled, globoid, 15-19// in diameter;
wall colorless, thin, 1// or less, smooth.
On Polypodiaceae :
Phegoplens Dryopieris (L>) Fee, Wisconsin. Type collected in Vilas County, Wisconsin, July 28, 1902, /. /. Davis.