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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-01). Data set reviewer(s): Schubert K. (06-07-25); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera polonica Siemaszko (pseudonym); Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Oidium hortensiae Jørst. Type: Oidium hortensiae Jørst.

Taxonomic Literature: Taxonomic notes: +hyphae tortuose, branched, septate, hyphal cells ca 40-50 x 5-7 µm; +appressoria multilobed, 5-25 µm wide, often opposite pairs;+conidiophores foot-cells straight, cylindric, followed by two shorter cells or a single longer cell;+haustoria globose, ca. 17.5-18.7 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [609] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Nearly cosmopolitan. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Benelux (Belgium & Luxembourg), Germany, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Greece, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic (mycelium dense, persistent or evanescent, white); growing on stems, leaves, and inflorescences. Host or Phorophyte Taxonomy: Hydrangea macrophylla (Thunb.) Ser.; Hydrangea, Hydrangeaceae.

Conidiophores: Pseudoidium-type; not branched ((57-)70-90(-175) x 7.5-8.7 µm, few 5-celled conidiophores occur on both sides of the leaves); basal cells (10)-17-37.5-(50) µm long, 7.5-10 µm wide. Conidium Formation: Conidiogenous cells single and in chains (rarely short chains). Conidia: Ellipsoid and ovoid; macroconidial (germ tubes at an end, often multiple, short to moderately long, without terminal, lobed appressorium), not branched, (25)-30-40-(45) µm long, (14)-16-19-(20) µm wide; aseptate.

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