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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. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe geraniacearum U. Braun & Simonyan. Type: Erysiphe geraniacearum U. Braun & Simonyan.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [213] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (?). Region(s): Far Eastern Asia. Country or state(s): Denmark, Norway, Sweden, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Spain (incl. Andorra & Monaco), 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; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Geranium pratense L.; Geranium, Geraniaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.075)-.08-.095-(.1) mm in diam.. Margin: External filaments present; mycelioid, straight, 1-4 µm long, 4-6 µm in diameter, pigmented (brown in the lower half, paler in the upper part), few, 8-12 per mm², growing all across the lower half of the ascocarp, geniculate (bent) (sometimes), thin, not ramified, septate.

Asci: 4-6 asci per ascocarp, indistinctly stipitate, 40-65-(80) µm long, (25)-30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-6 per ascus, subglobose, ellipsoid, or ovoid, 14-21 µm long, 8.5-13 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid; macroconidial, not branched, 28-34 µm long, 14-19.5 µm wide; aseptate.

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