Uredinia hypophyllous, scattered or in small groups, minute, round, yellow, pulverulent, 0.1-0.5 mm diameter;paraphyses clavate, 45-65 x 12-20 µm, wall 1.0-1.5 µm thick, hyaline, not or slightly thickened at apex;urediniospores globose, subglobose, obovate, or ellipsoid, 18-34 x 11-22 µm;walls 1.0-2.0 µm thick, minutely echinulate, germ pores obscure. Telia hypophyllous, scattered or gregarious, minute, round or irregular, 0.4 mm diameter, pulverulent, blackish-brown or black;teliospores cylindrical, (3-)6-7(-8)-septate, 60-135 x 22-30 µm, rounded at apex, not constricted at septa, walls 2.5-3.5 µm thick, chocolate-brown, minutely and closely verrucose with subhyaline tubercles, three germ pores in each cell;pedicels hyaline, persistent, up to 180 µm long. See Wei (1988) and Hiratsuka et al. (1992) for more detailed descriptions.
Related invasive species
- Phragmidium yamadanum
Related Farm Practice
- Groups
There is little published information on this plant pathogenic fungus, which is limited to parts of China and Japan. It infects Rubus spp., which exist in other regions of the world with similar environmental conditions, therefore this species may pose a threat to native or agricultural plants if introduced.