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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. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera sequinii Y. N. Yu & Y. Q. Lai; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera sequinii Y. N. Yu & Y. Q. Lai. Type: Microsphaera sequinii Y. N. Yu & Y. Q. Lai.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 10-22.5 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [391] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Castanea sequinii Dode; Castanea, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .114-.167 mm in diam.. Margin: External filaments present; recurved, .7-1.2 µm long, 8.8-12.5 µm in diameter, hyaline or pigmented (often in the lower half, brown), numerous, (8)-10-20-(21) per mm², growing between the lower and upper hald of the ascocarp, smooth or rough, thin or moderatly thick (towards the base), ramified, dichotomously branched ((3-)4-6 times, closely and regularly branched, rarely forked in the lower half, tips recurved), aseptate or septate (1-5 septa, frequently 1-2 septa).

Asci: 7-10-(16) asci per ascocarp, indistinctly stipitate, 54-84 µm long, 34-64 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 16.3-25 µm long, 10-16.3 µm wide; septa absent.

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