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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 hydrophyllacearum U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

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

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells of the upper half very conspicuous, irregularly polygonal, rather thick-walled, large, 8-40 µm diam., sometimes up to 50 µm in diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [246-247] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, Canada, generally distributed).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Hydrophyllum virginianum L.; Hydrophyllum, Hydrophyllaceae.

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-.15 mm in diam.. Margin: External filaments present (well developed, rather coarse, mostly straight at the base); straight, 1-3.5 µm long, 5-12-(15) µm in diameter, pigmented (shorter appendages completely brown, larger ones paler in the upper half), numerous, growing between the lower and upper hald of the ascocarp or on the upper half of the ascocarp, stiff and straight (mostly), smooth, thin, not ramified, septate.

Asci: 6-25 asci per ascocarp, distinctly stipitate, (50)-60-80 µm long, 25-40-(55) µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores 2-3 per ascus, subglobose, ellipsoid, or ovoid, (16)-20-25-(28) µm long, 11-16 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 28-38 µm long, 13.5-20 µm wide; aseptate.

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