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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-23); revised.

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

Type Information: Basionym: Microsphaera erineophila Peck. Type: Microsphaera erineophila Peck.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells indistinct, polygonal, ca. 9-20(-25) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [380] (1987).

Biogeography: Continent: Northern America (USA, from Mass. westwards to Wisc. and southward to Ala.; Canada). Country or state(s): Illinois (USA), Wisconsin (USA), Indiana (USA), Massachusetts (USA), New York (USA), Vermont (USA), West Virginia (USA), Alabama (USA), Maryland (USA), Virginia (USA), and District of Columbia (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves or galls (usually on Erineum galls). Host or Phorophyte Taxonomy: Fagus grandifolia Ehrh.; Fagus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious (on galls, scattered (1) outside the galls), .075-.11 mm in diam.. Margin: External filaments present; recurved (distinctly), (.5)-1-1.5-(2) µm long, 6-10 µm in diameter, hyaline or pigmented (brown throughout (cleistothecia on galls) or hyaline above and coloured near the base (cleistothecia outside the galls)), few, 3-10 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (mostly curved), smooth or verrucose, thin or thick (throughout or thin-walled above and thick-walled towards the base), ramified, dichotomously branched (3-6 times, branchings close and regular, tips distinctly recurved), aseptate or septate (0-1-septate).

Asci: 3-6 asci per ascocarp, not stipitate (usually), 40-50-(60) µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid, or ovoid, 15-22 µm long, 10-14.5 µm wide; septa absent.

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