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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. (06-05-17); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Sphaerotheca parietariae (Shvartsman) U. Braun & Simonyan; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascoc. outer wall cells irregularly polygonal, about 8-25 µm diam.;+ascoc. ext. fil. rather regular, straight, not undulate-geniculate;. Braun U., Beih. Nova Hedwigia 89: 1-700 [124] (1987).

Biogeography: Continent: Asia-Temperate. Country or state(s): Kazakhstan (and Armenia).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Parietaria chersonensis (Láng. & Szov.) Dörfl.; Parietaria, Urticaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, sub-scattered or gregarious, .08-.115 mm in diam.. Margin: External filaments present; interlaced with each other, straight, (1)-2-5-(6) µm long, (3)-4-7-(8) µm in diameter, hyaline or pigmented (brown below, paler to hyaline above), very numerous (densely crowded around the ascocarps), growing at the ascocarp base, all across the lower half of the ascocarp, or on the upper half of the ascocarp, flexuose (rather regular, straight, not undulate-geniculate), smooth, thin or moderatly thick (sometimes, especially in the lower half), not ramified, septate.

Asci: 1 asci per ascocarp, broadly clavate, not stipitate, 60-80 µm long, 50-65 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid or ovoid, 13-25 µm long, 13-23 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Doliiform or cylindrical; macroconidial, not branched, 25-30 µm long, 16-20 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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