Abstract
The new powdery mildew species Phyllactinia sebastianiae on Sebastiania brasiliensis (Euphorbiaceae) is described. This species was collected in Corrientes, Argentina, and is well characterized by conidiophores with twisted foot-cells and dimorphic conidia (lanceolate primary conidia and oblanceolate to ellipsoid-ovoid secondary conidia), indicating an anamorph belonging in the genus Streptopodium. Detailed descriptions and illustrations of both anamorph and teleomorph states of the new species are given, and it is compared with morphologically similar taxa.
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