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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 arabidis R. Y. Zheng & G. Q. Chen. Type: Erysiphe arabidis R. Y. Zheng & G. Q. Chen.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly shaped, ca. 6-21 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [253-254] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Arabis pendula L.; Arabis, Cruciferae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.08)-.1-.125-(.14) mm in diam.. Margin: External filaments present (width not uniform); mycelioid, straight, (.5)-1-2 µm long, (2.5)-5.5-10.5-(13) µm in diameter, pigmented (brown, somewhat paler upwards), numerous, 9-36-(55) per mm², growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified or ramified (rarely), irregular, septate.

Asci: (7)-9-16-(24) asci per ascocarp, distinctly stipitate (usually), (40)-50-70-(80) µm long, (20)-25-35-(40) µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores 2-(3) per ascus, ellipsoid or ovoid, (15)-18-23-(25) µm long, (10)-11.5-14-(16) µm wide; septa absent; wall thin.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Cylindrical; macroconidial, not branched, 23-38 µm long, 11.5-18 µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

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