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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-02). Data set reviewer(s): Schubert K. (06-04-05); revised.

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

Type Information: Basionym: Phyllactinia juglandis-mandshuricae Y. N. Yu. Type: Phyllactinia juglandis-mandshuricae Y. N. Yu.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly shaped;. Braun U., Beih. Nova Hedwigia 89: 1-700 [587] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Juglans mandshurica Maxim.; Juglans, Juglandaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .229-.289-.312 mm in diam.. Margin: External filaments present (395-677 µm long); not interlaced, straight, 1.5-2 µm long, few, 5-10 per mm², stiff and straight, not ramified.

Asci: 18-33 asci per ascocarp, distinctly stipitate, 98-128 µm long, 29-37 µm wide; dehiscence unitunicate (numerous).

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 34-49 µm long, 20-27 µm wide; septa absent.

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