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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 amaranthi R. L. Mathur, B. L. Mathur & Bhargava. Type: Oidium amaranthi R. L. Mathur, B. L. Mathur & Bhargava.

Taxonomic Literature: Taxonomic notes: + hyphae 3.5-7 µm wide; + conidiophores erect, 1-3-septate, 14-52.5 x 3.5-8.7 µm. Braun U., Beih. Nova Hedwigia 89: 1-700 [597] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves (effuse), epiphyllous (superficial, circular patches, white, later covering the entire surface of the leaves). Host or Phorophyte Taxonomy: Amaranthus caudatus L.; Amaranthus, Amaranthaceae.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single (conidia described to be catenate, but undoubtedly produced singly). Conidia: Doliiform (oblong-); macroconidial, not branched, 22.7-45.5 µm long, 10.5-21 µm wide; aseptate.

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