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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-01). Data set reviewer(s): Schubert K. (06-07-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Oidium agerati J. M. Yen. Type: Oidium agerati J. M. Yen.

Taxonomic Literature: Taxonomic notes: +hyphae tortuose, branched, septate, 4.5-8.4 µm wide; +appressoria nipple-shaped;+conidiophores erect, 3-5(-6)-septate, 85-138 x 13.2-18 µm, foot-cells cylindric;. Braun U., Beih. Nova Hedwigia 89: 1-700 [597] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves (white, effuse, confluent), amphigenous. Host or Phorophyte Taxonomy: Ageratum conyzoides L.; Ageratum, Compositae.

Conidiophores: Euoidium-type; not branched; basal cells 30-56.4 µm long, 10.8-13.2 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ovoid or doliiform; macroconidial, not branched, 28.8-38.4 µm long, 18-22.8 µm wide; aseptate.

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