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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. (06-01-25); revised.

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

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

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, obscure, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [229] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China. Country or state(s): Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (usually) or amphigenous. Host or Phorophyte Taxonomy: Macleaya cordata (Willd.) R. Br.; Macleaya, Papaveraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .07-.095-(.1) mm in diam.. Margin: External filaments present; mycelioid, straight, (.5)-1-7 µm long, (4)-5-8-(10.5) µm in diameter, pigmented (brown in the lower half, paler upwards, subhyaline at the apex), numerous, 6-25 per mm², growing all across the lower half of the ascocarp, flexuose (often tortuose-undulate), smooth or verrucose (often, throughout), thin, not ramified (mostly, rarely with short outgrowths), septate.

Asci: 2-5 asci per ascocarp, not stipitate or indistinctly stipitate, (40)-50-70 µm long, (30)-35-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 8 per ascus, spores (2)-3-4-(5) per ascus, ellipsoid, ovoid, or slightly curved (rarely), (20)-24-38 µm long, 12-16.5 µm wide; septa absent; wall pale brown (yellowish, often with oil droplets).

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial, not branched, 28-43 µm long, 11.5-20 µm wide; aseptate.

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