Uredinopsis americana Syd. & P. Syd. 1903

Uredinopsis mirabilis (Peck) Magn. Hedwigia 43 : 121. 1904
Scbioria mirabilis Peck, Ann. Rep. N. Y. State M us. 25 : 87. 1873.
Uredinopsis americana Sydow, Ann Myc. 1: 325. .1903
Milesia mirabilis Arth. R6sult. Sci. Congr. Bot. Vienne 337. 1906.
I Aecia hypophyllous, scattered, or somewhat gregarious, roundish, small, 0.1-0.2 mm across; peridium strongly developed; aeciospores angularly obovate or polyhedral, 15-20 by 24-36^; wall colorless, medium thick, 2-3^, thicker at the angles, minutely
verrucose. Uredinia hypopliyllous, scattered on discolored areas, roundish, small, 0.1-0.2 mm across, soon dehiscent by apical rupture ; peridia as in aecia, but more delicate ; urediniospores fusiform or ovate-fusiform, 12-17 by 35-50,", acuminate above, with apex prolonged into a tapering, pointed beak, 3-12 fi long; wall colorless, thin, 1// or less, smooth except the two distinctly echinulated lines of closely set, minute points.
III. Teliospores scattered in the mesophyl of the leaf, globose, or somewhat broader than high, 25-29// broad by 20-23 fi high, 2-4-celled ; wall colorless, thin, 1/*, smooth.
On Polypodiaceae :
Lorinseria areolata (I,.) Presl {Woodwardia areolata Moore), New Jersey, New York. Onoclea sensibilis I,., ^ Connecticut, Illinois, Maine, Maryland, Massachusetts, New York, Pennsylvania, Wisconsin, Type locality : Sandlake, New York, on Onoclea sensibilis.
Distribution : Maryland to Wisconsin and northward into Canada ; also in Europe.