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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. (06-03-27); revised.

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

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

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+ascocarp outer wall cells obscure, irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [211-212] (1987).

Biogeography: Continent: Northern America (USA). Country or state(s): West Virginia (USA), Maryland (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous. Host or Phorophyte Taxonomy: Hydrangea arborescens L.; Hydrangea, Hydrangeaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (often depressed and only 50-60 µm high). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .075-.11 mm in diam.. Margin: External filaments present (irregular, length variable); mycelioid, straight, (.5)-1-6 µm long, 3-9.5 µm in diameter, hyaline or pigmented (later, yellowish to brownish, paler or hyaline in the upper half), few or numerous, (5)-8-15-(20) per mm², growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, septate.

Asci: (3)-4-5-(6) asci per ascocarp, not stipitate or indistinctly stipitate, 45-65 µm long, 30-40-(55) µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 5-8 per ascus, subglobose, ellipsoid, or ovoid, 16-22.5 µm long, 9-14.5 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or ovoid; macroconidial, not branched, 26-33 µm long, 13-18 µm wide; aseptate.

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