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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. (06-01-26); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera tortilis (Wallr. : Fr.) Speer; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha tortilis Wallr. Type: Alphitomorpha tortilis Wallr.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, short, followed by 1-2 shorter cells (ca. 10-25 µm long);+appressoria hardly lobed;+ascomata outer wall cells irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [300-302] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Armenia, Georgia) and Europe. Region(s): Caucasus. Country or state(s): Finland, United Kingdom, Germany, Hungary, Netherlands, Poland, France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Crimea (Ukraine), and Ukraine; Transcaucasus (Armenia, Azerbaijan & Georgia) and Iran.

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Cornus sanguinea L.; Cornus, Cornaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.065)-.075-.095-(.11) mm in diam.. Margin: External filaments present (more or less turning towards one direction, sometimes nearly fasciculate); interlaced with each other (loosely), mycelioid or setiform (intermediary), straight, 5-15 µm long, 3-9 µm in diameter, pigmented (brown below, paler upwards), numerous, 10-20 per mm², growing between the lower and upper hald of the ascocarp, flexuose, thin or moderatly thick (towards the base), not ramified or ramified (partly), not branched (1(-2) times, branching wide, loose, often deeply celft) or dichotomously branched, septate.

Asci: 2-6 asci per ascocarp, not stipitate or indistinctly stipitate, 40-65 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-6 per ascus, ellipsoid or ovoid, 16-25 µm long, 10-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 20-35 µm long, 6-8-(9) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or cylindrical; macroconidial, not branched, 25-40 µm long, 13-21 µm wide; aseptate.

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