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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-22); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe begoniae R. Y. Zheng & G. Q. Chen. Type: Erysiphe begoniae R. Y. Zheng & G. Q. Chen.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, ca. 6-20(-23) µm diam.;noch nichts eingetragen Problem miro- und macroasci. Braun U., Beih. Nova Hedwigia 89: 1-700 [187] (1987).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or inflorescences, amphigenous. Host or Phorophyte Taxonomy: Begonia yunnanensis H. Lév.; Begonia, Begoniaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.08)-.09-.105-(.119) mm in diam.. Margin: External filaments present (substraight, curved to tortuous, (40-)81-240(-439) µm long, width subuniform throughout or somewhat attenuated upwards); straight, (.5)-1-2-(4) µm long, (3.5)-5-9-(10) µm in diameter, pigmented (brown), numerous, (3)-13-25-(35) per mm², growing all across the lower half of the ascocarp, smooth or verrucose, thin, not ramified or ramified, irregular (seldom), septate.

Asci: (3)-5-7-(8) asci per ascocarp, not stipitate or indistinctly stipitate, (30)-33-63.5-(68.5) µm long, (22.9)-25-46-(48) µm wide; dehiscence unitunicate (two types of asci in the same ascocarp, micro-asci and macro-asci).

Ascospores: 1–2 to c. 4 per ascus, spores 2-5 per ascus, ellipsoid or ovoid, (11)-13-23-(25) µm long, (7.5)-9-14-(15) µm wide; septa absent; wall pale brown (yellowish).

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or sub-cylindrical; macroconidial, not branched, 23-38 µm long, 13-16 µm wide; aseptate.

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