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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. (06-03-29); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Golovinomyces ulmariae (Desm.) V. P. Gelyuta; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe ulmariae Desm. Type: Erysiphe ulmariae Desm.

Taxonomic Literature: Taxonomic notes: +conidiophores foot cells followed by 1-2 shorter cells;+appressoria lobed;+ascocarp outer wall cells obscure, irregularly polygonal, ca. 7-15(-20) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [182-184] (1987); Braun, U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe. Region(s): Siberia and Far Eastern Asia. Country or state(s): Finland, United Kingdom, Norway, Sweden, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Kazakhstan and Japan.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves. Host or Phorophyte Taxonomy: Filipendula ulmaria (L.) Maxim.; Filipendula, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .08-.14 mm in diam.. Margin: External filaments present (delicate); interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, .5-6 µm long, (3)-3.5-6.5 µm in diameter, hyaline or pigmented (later yellowish to brown; paler to hyaline in the upper half), numerous, growing all across the lower half of the ascocarp or between the lower and upper hald of the ascocarp (sometimes), smooth or rough (seldom), thin, not ramified or ramified, irregular, septate.

Asci: (4)-6-16 asci per ascocarp, distinctly stipitate, 50-80 µm long, 25-40-(50) µm wide; dehiscence unitunicate (the asci are easily to be seen within the intact ascocarps).

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

Conidiomata: Present; hyphomycetous (conidiophores erect, foot cells followed by 1-2 shorter cells).

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, sometimes doliiform, or cylindrical; macroconidial (germ tubes at an end, short, terminating in a lobed appressorium), not branched, 24-36 µm long, 10-22 µm wide; aseptate.

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