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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. Synonyms: Oidium ailanthi P. K. Dubey, P. Prakash & Manohar.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Oidium ailanthi Bhagyan. & Ramachar. Type: Oidium ailanthi Bhagyan. & Ramachar.

Taxonomic Literature: Taxonomic notes: +hyphae septate, hyaline, 4-6(-11) µm wide; +appressoria multilobed;+conidiophores erect, 1-3-septate, 45-150 x 5.6-12 µm wide, foot-cells straight, cylindric;. Braun U., Beih. Nova Hedwigia 89: 1-700 [597] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves (effuse or patches, irregular), amphigenous (sometimes covering the entire surface of the leaves). Host or Phorophyte Taxonomy: Ailanthus excelsa Roxb.; Ailanthus, Simaroubaceae.

Conidiophores: Not branched. Conidium Formation: Conidiogenous cells single or short in chains. Conidia: Ovoid or cylindrical (oblong-); macroconidial (germ tubes arising from an end of the spore, short to moderately long, up to 145 µm, apex simple or terminating in a moderately lobed appressorium), not branched, (17)-25-40-(46) µm long, 10-21.6 µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

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