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

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera pseudacaciae (P. D. Marchenko) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Trichocladia pseudacaciae P. D. Marchenko. Type: Trichocladia pseudacaciae P. D. Marchenko.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal to rounded, ca. 7-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [352] (1987).

Biogeography: Continent: Europe. Country or state(s): Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Robinia pseudacacia L.; Robinia, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .06-.1 mm in diam.. Margin: External filaments present (very long and flaccid, often with a tendency to turn towards one direction); interlaced with each other (and with the appandages of the surrounding ascocarps), recurved (when mature, at least partly) or straight, 4-12 µm long, 8-10 µm in diameter, hyaline or pigmented (sometimes at the very base), few, 5-10-(15) per mm², growing between the lower and upper hald of the ascocarp, smooth, thin or thick (towards the base), not ramified or ramified (usually), dichotomously branched (1-5 times, branchings irregular to regular, primary branches mostly somewhat elongated, horizontally spread or somewhat recurved, tips of the ultimate branchlets recurved when mature, at least partly), aseptate or septate (0-1-septate).

Asci: 3-6 asci per ascocarp, not stipitate (rarely) or indistinctly stipitate, 40-60 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (3)-4-5-(6) per ascus, ellipsoid or ovoid, 15-24 µm long, 8-16 µm wide; septa absent.

Conidiophores: Pseudoidium-type. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched; aseptate.

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