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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 caucasica Simonyan. Type: Erysiphe caucasica Simonyan.

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+conidiophores foot-cells cylindric, followed by a shorter cell;+ascocarp outer wall cells irregularly shaped or polygonal, ca. 8-25 µm diam., occasionally up to 30 µm;. Braun U., Beih. Nova Hedwigia 89: 1-700 [187-188] (1987).

Biogeography: Continent: Asia-Temperate and Australasia (Central Asia, Armenia, endemic).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Aetheopappus pulcherrimus (Willd.) Cass.; Aetheopappus, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.055)-.075-.095-(.105) mm in diam.. Margin: External filaments present; interwoven with surrounding mycelium, mycelioid, straight, .5-2.5 µm long, 4-9 µm in diameter, hyaline or pigmented (when mature, yellowish to brown below, paler to hyaline in the upper half), few, growing all across the lower half of the ascocarp, smooth or rough, thin or moderatly thick (occasionally, especially near the base), not ramified (usually), usually not branched, septate.

Asci: 3-5 asci per ascocarp, not stipitate (subsessile) or indistinctly stipitate, (40)-50-65 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2 (rarely) or c. 4 per ascus, spores (1)-3-4 per ascus, ellipsoid or ovoid, 18-26 µm long, 8.5-15.5 µm wide; septa absent.

Conidiomata: Present; hyphomycetous (conidiophores straight, erect, foot cells cylindric, followed by a shorter cell).

Conidiophores: Pseudoidium-type; not branched; basal cells 25-35 µm long, 5.5-9-(11) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid (conidia length and width measured on dried specimen), ovoid, or doliiform; macroconidial, not branched, 26-37 µm long, 13-19 µm wide; aseptate.

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