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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 cephalanthi Sawada. Type: Oidium cephalanthi Sawada.

Taxonomic Literature: Taxonomic notes: +hyphae sparsely branched, hyaline, 4-6 µm wide; +appressoria lobed, branched;+conidiophores foot-cells curved, followed by 1-2 shorter cells;. Braun U., Beih. Nova Hedwigia 89: 1-700 [603] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Cephalanthus occidentalis L.; Cephalanthus, Rubiaceae.

Conidiophores: Pseudoidium-type; not branched (erect, arising from a side of the hyphae); basal cells 16-32 µm long, 8-10 µm wide. Conidium Formation: Conidiogenous cells single (occasionally 2 conidia). Conidia: Ellipsoid or oblong-obtuse; macroconidial (conidia with spherical granules), not branched, rounded at both ends, 24-28.5-34 µm long, 14-16.34-17 µm wide; aseptate.

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