Uredinia hypophyllous, scattered or in small groups, minute, circular, yellow, pulverulent, 0.4 mm diameter;paraphyses clavate, erect or incurved, hyaline;urediniospores globose, broadly ellipsoid to obovoid, 17-23 x 14-20 µm;walls 1.0-1.5 µm thick, coarsely echinulate, pale-yellow. Telia hypophyllous, scattered or gregarious, minute, round, 0.7-2.5 mm diameter, pulverulent, black;teliospores cylindrical, (2-)5(-8)-septate, 40-116 x 25-42 µm, rounded at apex, more or less constricted at septum;walls 2.5-5.0 µm thick, orange-brown to blackish-brown, somewhat verrucose, two to three germ pores in each cell;pedicels hyaline, persistent, 100-144 µm long. See Wei (1988) for a more detailed description.
Related invasive species
- Phragmidium assamense
Related Farm Practice
- Groups
There is little published information on this plant pathogenic fungus, which has limited geographic distribution. 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.