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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-28); revised.

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

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

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 12-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [345-346] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous. Host or Phorophyte Taxonomy: Corylus yunnanensis (Franch) A. Camus; Corylus, Corylaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .075-.115 mm in diam.. Margin: External filaments present (52-90 µm long); not interlaced, straight (obtuse or truncate), .5-.8-(1) µm long, hyaline or pigmented (in the basal half), few, 6-9 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, distinctly verrucose (throughout), ramified, dichotomously branched (3-5 times, branchings rather close and regular, compact, tips of the ultimate branchlets obtuse or truncate, not recurved), aseptate.

Asci: (2)-3-5-(7) asci per ascocarp, not stipitate (subsessile) or indistinctly stipitate, 44-60 µm long, 31-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 5-8 per ascus, ellipsoid or ovoid, 16-24 µm long, 9-15 µm wide; septa absent.

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