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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 cassiae-siameae J. M. Yen. Type: Oidium cassiae-siameae J. M. Yen.

Taxonomic Literature: Taxonomic notes: +hyphae flexuous, branched, 3.5-6 µm wide; +appressoria ovoid, regular to lobed;+conidiophores foot-cells flexuous, followed by 1-2 shorter cells;. Braun U., Beih. Nova Hedwigia 89: 1-700 [603] (1987).

Biogeography: Continent: Africa (Tanganyika) and Asia-Temperate. Country or state(s): Taiwan.

Ecology: Biotroph; phytopathogenic; growing on leaves (effuse, irregular patches), hypophyllous or amphigenous (rarely). Host or Phorophyte Taxonomy: Cassia siamea Lam.; Cassia, Leguminosae-Papilionoideae.

Conidiophores: Pseudoidium-type; not branched (erect, cylindric, 2-3-septate, 63.6-103 x 8.4-12 µm); basal cells 24-60 µm long, 6-8.4 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial (germ tubes at an end, long, simple, without lobed appressorium), not branched, 24-40 µm long, 12-18 µm wide; aseptate.

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