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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. (06-03-23); revised.

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

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

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, large, 10.5-25(-30.5) µm in diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [228] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mainly) or amphigenous. Host or Phorophyte Taxonomy: Firmiana simplex (L.) W. Wright; Firmiana, Sterculiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (fragile). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, gregarious, (.082)-.093-.112 mm in diam.. Margin: External filaments present (length variable, long or short); straight, (1)-2-5.5 µm long, 4-6-(9.5) µm in diameter, sub-hyaline or pigmented (brown, paler upwards, subhyaline at the apex), few or numerous, 8-16-(22) per mm², growing all across the lower half of the ascocarp, sub-geniculate (bent) (often; substraight to curved), verrucose (throughout), thin, not ramified, septate.

Asci: 3-6 asci per ascocarp, not stipitate or very indistinctly stipitate, 45-65 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 or c. 4 per ascus, spores (2)-3-4-(5) per ascus, ellipsoid or ovoid, (18)-20-23-(25.5) µm long, (11.5)-14-15-(18) µm wide; septa absent; wall pale brown (yellowish).

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial, not branched, 20-33 µm long, 13-15 µm wide; aseptate.

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