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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-02). Data set reviewer(s): Schubert K. (06-04-04); revised.

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

Type Information: Basionym: Phyllactinia corylea var. angulata E. S. Salmon. Type: Phyllactinia corylea var. angulata E. S. Salmon.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells long, followed by shorter cells or a short foot-cell followed by a very long second cell and some shorter cells;+ascomata outer wall cells obscure, irregularly shaped, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [593] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (usually) or amphigenous. Host or Phorophyte Taxonomy: Castanea sativa Mill.; Castanea, Fagaceae and Ulmaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.18)-.2-.28-(.34) mm in diam.. Margin: External filaments present (basal swelling ca. 30-65 µm diam.); not interlaced, straight, (.75)-1-1.5-(2) µm long, numerous, 6-20 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, not ramified.

Asci: At least 20 asci per ascocarp, distinctly stipitate, 70-120 µm long, 25-40 µm wide; dehiscence unitunicate (very numerous).

Ascospores: 1–2 to c. 4 per ascus, spores 2-(3) per ascus, ellipsoid or ovoid, 30-50 µm long, 15-25 µm wide; septa absent.

Conidiophores: Ovulariopsis-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical (characteristically angular in outline, often centrally constricted, rarely some conidia subclavate; sometimes nearly or more rounded); macroconidial (germ tubes arising from a side or an end of the spore, straight to hooked, short to moderately long, narrow), not branched, 35-60-(80) µm long, 16-26-(30) µm wide; aseptate.

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