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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera juglandis-nigrae U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera juglandis-nigrae U. Braun. Type: Microsphaera juglandis-nigrae U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [409-410] (1987).

Biogeography: Continent: Northern America (USA, widespread, there are North American records of).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Juglans nigra 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, .085-.11 mm in diam.. Margin: External filaments present; recurved, .75-1.25 µm long, 6-8 µm in diameter, hyaline, few, 5-13 per mm², growing between the lower and upper hald of the ascocarp, rough, thin or thick (towards the base), ramified, dichotomously branched (3-4-5 times, branchings close and regular, tips recurved), aseptate or septate (with a single septum at the base).

Ascospores: c. 4 to c. 8 per ascus, spores 4-5 per ascus, ellipsoid or ovoid, 16-22 µm long, 10-14 µm wide; septa absent.

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