Gerwasia rubi

Spermogonia intraepidermal. Aecia like uredinia. Uredinia epiphyllous (on upper surface of leaf), solitary or a few aggregated on small yellow or purple spots, small, rounded, 0.1-0.3 mm diameter, covered by epidermis, orange-yellow, reddish-brown or yellowish-brown;urediniospores globose, ovate or ovate-ellipsoid, sparsely echinulate, hyaline or pale-yellowish, 22-35 x 16-26 µm, wall 2-3 µm thick. Telia hypophyllous (on lower side of leaf), white, developing in minute, rounded, yellow lesions;teliospores formed on cells emerging through stomata, globose, short-pedicellate, 20-30 x 18-22 µm, walls smooth, thin, hyaline. See Ito (1950) and Hirastuka et al. (1992) for more detailed descriptions.