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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. (06-01-24); revised.

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

Type Information: Basionym: Erysiphe actinostemmatis U. Braun. Type: Erysiphe actinostemmatis U. Braun.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, ca. 8-15 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [205] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Actinostemma lobata Maxim.; Actinostemma, Cucurbitaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.075)-.095-.135-(.155) mm in diam.. Margin: External filaments present; interlaced with each other (often), mycelioid, straight, (.25)-.5-2-(2.5) µm long, (3.5)-4.5-8-(10) µm in diameter, pigmented (yellowish or brown in the lower part, paler above), numerous, growing all across the lower half of the ascocarp, smooth or somewhat rough, thin, not ramified, septate.

Asci: 4-8 asci per ascocarp, usually not stipitate or indistinctly stipitate (sometimes), (40)-50-60-(70) µm long, (25)-30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-4-5-(6) per ascus, ellipsoid or ovoid, 17-24 µm long, 9.5-15.5 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial, not branched, 30-38 µm long, 13-17.5 µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

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