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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set reviewer(s): Schubert K. (06-02-28); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Uncinula clandestina var. clandestina (Biv.) J. Schröt.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe clandestina var. clandestina Biv. Type: Erysiphe clandestina var. clandestina Biv.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, moderately long, followed by two shorter cells;+ascomata outer wall cells irregularly polygonal, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [505-506] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe (throughout), and Northern America (records are very doubtful). Region(s): Siberia, Far Eastern Asia, and China (and Central Asia). Country or state(s): United Kingdom, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, 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; Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Ulmus campestris L.; Ulmus, Ulmaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.07)-.075-.1-(.115) mm in diam.. Margin: External filaments present (width increasing upwards, apex usually somewhat enlarged); uncinate (fairly closely) or circinate, .75-2 µm long, (4)-8-6.5-(10) µm in diameter, hyaline, 9-19 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (straight or somewhat curved), nearly smooth (rarely) or verrucose, thin or thick (towards the base), not ramified, aseptate.

Asci: 3-6 asci per ascocarp, sub-globose (often), not stipitate or indistinctly stipitate, 35-50 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 21-30 µm long, 12-20 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial, not branched, (25)-30-40-(45) µm long, (12)-14.5-18.5-(23) µm wide; aseptate.

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