Phakopsora desmium (Berk. & Broome) Cummins 1945

Kuehneola gossypii (I^agerh.) Arthur
Uredo Gossypii Ivagerh. Jour. Myc. 7 : 48. 1891.
O. Pycnia not seen.
Uredinia at first (primary) epiphyllous, rather deep-seated in the tissues, soon
^ secondary) hypophyllous, more shallow, scattered over the leaf, or somewhat grouped on purplish spots 1-5 mm. across, bullate, roundish, 0.1-0.5 mm. across, tardilynaked, slightly
pulverulent, brownish-yellow, ruptured epidermis overarching and conspicuous ; paraphyses with secondary uredinia numerous, peripheral, appearing somewhat higher than the sporemass, more or less clavate, usually incurved, 7-15 by 45-65/^, the wall uniformly thin, 1/^ or less, colorless, smooth; urediniospores ellipsoid or broadly obovate, 16-19 by 19-27//; wall pale-yellow or nearly colorless, thin, 1-1. 5/^, rather closely and noticeably echinulate, points 1-1.5 /^ apart, the pores inconspicuous, probably 2, equatorial.

Phakopsora gossypii is a plant pathogen and causal agent of cotton rust.