Uredinopsis pteridis Dietel & Holway, 1895
Spermogonia at the underside of the current year needles, subepidermal, colourless. There also in two rows the aecia, up to 0.2 mm wide and 1 mm high, white, fragile.
uredinia hypophyllous yellowish brown pustules on vein-limited leaf spots. The urediniospores are extruded as a thread; they are distinctly spinulose, short-stalked elliptic, distally with a short sharp beak. The more or less globular, usually 4-celled teliospores are formed below the epidermis, scattered in the leaf mesophyll.
Brandenburger (1985a: 8), Gäumann (1959a), Klenke & Scholler (2015a), McTaggart, Geering & Shivas (2014a).