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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 juglandis Golovin; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera juglandis Golovin. Type: Microsphaera juglandis Golovin.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal to rounded, ca. 7.5-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [376-377] (1987).

Biogeography: Continent: Asia-Temperate (Central Asia) and Asia-Tropical. Region(s): Far Eastern Asia and China (+ Central Asia). Country or state(s): Japan; India.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Juglans regia L.; Juglans, Juglandaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .075-.135 mm in diam.. Margin: External filaments present; mycelioid or setiform, recurved (primary branches usually elongated, tips of the ultimate branchlets distinctly recurved), (.5)-1-1.5-(3) µm long, 7-9 µm in diameter, hyaline or pigmented (between base and septa), few or numerous, 3-17 per mm², growing between the lower and upper hald of the ascocarp, somewhat flexuose or stiff and straight (curved), rough, thin or moderatly thick (towards the base), ramified, dichotomously branched (1-3(-4) times, branchings loose, wide, deeply cleft, sometimes forked in the lower half or at the base, primary branches usually elongated, tips distinctly recurved when mature, ultimate branchlets often twisted in different planes), aseptate or septate (0-2-septate).

Asci: 3-10 asci per ascocarp, not stipitate or indistinctly stipitate, (35)-40-65-(75) µm long, 35-50-(55) µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-4-8 per ascus, subglobose, ellipsoid, or ovoid, 14-28-(30) µm long, 9-17 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid; macroconidial, not branched, 22-31 µm long, 11-14 µm wide; aseptate.

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