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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-31). Data set reviewer(s): Schubert K. (06-04-05); revised.

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

Type Information: Basionym: Typhulochaeta japonica var. couchii Solheim, Eboh & McHenry. Type: Typhulochaeta japonica var. couchii Solheim, Eboh & McHenry.

Taxonomic Literature: Taxonomic notes: +appressoria more or less lobed, evanescent to subpersistent;+ascomata outer wall cells obscure, irregularly shaped, ca. 5-20 µm diam., peridium fairly thin, ca. 8-15 µm wide, yellowish to light brown, semitransparent, revealing asci and ascospores;. Braun U., Beih. Nova Hedwigia 89: 1-700 [554-556] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, endemic). Country or state(s): Arizona (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Quercus arizonica Sarg.; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.08)-.12-.16-(.19) mm in diam.. Margin: External filaments present (special apical cells); interwoven with surrounding mycelium (irregular hyphae at the base, these hyphae attach the ascocarps to the mycelium), straight, .35 µm long, 3.5-10 µm in diameter, hyaline, numerous, 5-30 per mm², growing on the upper half of the ascocarp, stiff and straight (sometimes curved or irregular), smooth or rough, thin or moderatly thick (below), not ramified, aseptate.

Asci: 6-15 asci per ascocarp, distinctly stipitate, 65-105 µm long, 35-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (7)-8 per ascus, subglobose, ellipsoid, broadly ellipsoid, or ovoid, 19-36 µm long, 11-26 µm wide; septa absent.

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