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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-20).

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

Type Information: Basionym: Erysiphe gracilis var. longissima Y. Nomura. Type: Erysiphe gracilis var. longissima Y. Nomura.

Taxonomic Literature: Taxonomic notes: + cleistothecia: cellulae peridii irregulariter angulatae, 7,5-18 × 12,5-16,5 µm. Nomura Y., Taxonomical study of Erysiphaceae of Japan. - 1-281 [204-206]. Tokyo (1997).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Quercus acuta Thunb.; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (atro-brunnea), orbicular (spheroidea), scattered, .07-.12 mm in diam.. Margin: External filaments present; mycelioid, straight, (200)-300-800 µm long, 4-7 µm in diameter, hyaline, few or numerous, 4-25 per mm², growing at the ascocarp base, not ramified, not branched (raro ramulis brevibus protuberationi similibus), aseptate.

Asci: 3-5 asci per ascocarp, globose (ovati vel ellipsoidei), indistinctly stipitate, 38-58 µm long, 32-45 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 5-7 per ascus, ovoid, 20-25 µm long, 7-13 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched (1-2-septata, raro ad basim semel torta); conidiophore cells 50-80 µm long, basal cells 7-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or ovoid; macroconidial, not branched, 30-45 µm long, 16-23 µm wide; aseptate.

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