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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. (06-02-22); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe greeneana U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

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

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells long, cylindric;+ascocarp outer wall cells irregularly shaped, ca. 6-28 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [260-261] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, O. and Tenn. to Wisc., Kans. and Mont.). Country or state(s): Colarado (USA), Montana (USA), Oregon (USA), Illinois (USA), Iowa (USA), Kansas (USA), Nebraska (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), New York (USA), Ohio (USA), Maryland (USA), and Tennessee (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Parietaria pensylvanica Muhl.; Parietaria, Urticaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .085-.145 mm in diam.. Margin: External filaments present (densely crowded aroung the around the fruit-body); interlaced with each other, mycelioid, straight, .5-2 µm long, 4.5-10.5 µm in diameter, pigmented (when mature, yellowish to brown throughout or at least in the lower half), very numerous, growing all across the lower half of the ascocarp or on the upper half of the ascocarp (few reaching), smooth or somewhat rough (occasionally in the lower half), thin, not ramified, septate.

Asci: 6-20 asci per ascocarp, distinctly stipitate, 50-85 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 or c. 4 per ascus, spores 2-(3) per ascus, ellipsoid or ovoid, 18-25 µm long, 9.5-15.5 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid or ovoid; macroconidial (length and width measured on dry material), not branched, 26-36 µm long, 12-18 µm wide; aseptate.

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