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Spermogonia epiphyllous, aggregated in minute groups opposite aecia, indefinite, becoming fused, subcuticular, 25-30 mm diameter. Aecia hypophyllous, caeomoid, circular or annulate, up to 1 mm diameter, orange, paraphysate;a eciospores globose to broadly ellipsoid, 25-22 x 23-16 µm;wall hyaline, coarsely verrucose with broad shallow warts up to 3 µm diameter, 1.5-2.0 µm thick, pores obscure. Uredinia hypophyllous, irregularly scattered without spots or on small reddish, yellowish, brownish, or purplish spots, occasionally on larger purplish blotches, 0.1-0.3 mm diameter, yellowish, paraphysate;urediniospores obovoid to ellipsoid, 19-24 x 16-18 µm;wall hyaline, echinulate, spines 1-2 µm apart, 0.5 µm high, 1-2 µm thick, pores 2.5-4.0 µm diameter, obscure, paraphyses cylindric-clavate, incurved, 40-60 x 8-13 µm, wall thickened to 2-3 µm at apex. Telia scattered or aggregate, minute, round or irregular, black;t eliospores cylindric, not constricted at septa, apex rounded and with a blunt apiculus, up to 13-19 long x 5-7 µm wide, 3-6-septate, dimensions excluding apiculus: 3-septate 59-71 x 30-37 µm;4-septate 73-89 x 32-37 µm;5-septate 86-104 x 32-37 µm;6-septate 98-111 x 32-36 µm;wall sienna to dark umber-brown, verrucose, 4-5 µm thick, pores two to four in each cell;pedicels 75-160 µm long, 7-10 µm wide at neck, swollen below to 13-19 µm wide. See Wilson and Henderson (1966), Laundon and Rainbow (1969), and Petrova and Denchev (2004) for more detailed descriptions.

Related invasive species

  • Phragmidium bulbosum

Related Farm Practice

  • Groups
Impact

There is little published information on this plant pathogenic fungus, which has limited geographic distribution. As hosts exist in other regions of the world with similar environmental conditions, this species may pose a threat to native or agricultural plants if introduced.

Has Cabi datasheet ID
40529
Oss tagged
x

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