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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-hirsutae W. Y. Yen. Type: Oidium cassiae-hirsutae W. Y. Yen.

Taxonomic Literature: Taxonomic notes: +hyphae tortuose, branched, septate, 5-8.4 µm wide; +appressoria nipple-shaped;+conidiophores foot-cells cylindric, straight;. Braun U., Beih. Nova Hedwigia 89: 1-700 [603] (1987).

Biogeography: Continent: Asia-Tropical. Country or state(s): Peninsular Malaysia (= Malaya, Malaysia).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (white, effuse, confluent). Host or Phorophyte Taxonomy: Cassia hirsuta L.; Cassia, Leguminosae-Papilionoideae.

Conidiophores: Pseudoidium-type; not branched (erect, 3-7-septate, 85-229 x 14.4-20 µm); basal cells 50.4-69 µm long, 13.2-15.6 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ovoid or cylindrical; macroconidial, not branched, 33.6-56.4 µm long, 16.8-27.6 µm wide; aseptate.

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