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Erysiphe helwingiae (Sawada) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-01-25); revised.

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

Type Information: Basionym: Microsphaera helwingiae Sawada. Type: Microsphaera helwingiae Sawada.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal, ca. 10.30 µm diam;. Braun U., Beih. Nova Hedwigia 89: 1-700 [396] (1987).

Biogeography: Continent: Asia-Temperate. Country or state(s): Japan (endemic).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Helwingia japonica (Thunb.) F. Dietr.; Helwingia, Cornaceae.

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-.115 mm in diam.. Margin: External filaments present; mycelioid or setiform (intermediary, rather setiform), recurved (primary branches sometimes elongated, tips of the ultimate branchlets recurved), 1-2.5 µm long, 8-12 µm in diameter, hyaline or pigmented (sometimes at the base), few or numerous, 4-12 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth, thin or thick (towards the base), ramified, dichotomously branched (4-6 times regularly and closely, primary branches sometimes elongated, tips recurved), aseptate or septate (0-1-septate).

Asci: 3-6 asci per ascocarp, not stipitate or indistinctly stipitate, 45-60 µm long, 35-50 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 5-7 per ascus, ellipsoid or ovoid, 18-24 µm long, 10-13 µm wide; septa absent.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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