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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. ulmi-foliaceae (Dzhaf.) R. Y. Zheng & G. Q. Chen; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula clandestina f. ulmi-foliacea Dzhaf. Type: Uncinula clandestina f. ulmi-foliacea Dzhaf.

Taxonomic Literature: Taxonomic notes: This variety differs from var. clandestina by ascomata characters, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [505-506] (1987).

Biogeography: Continent: Asia-Temperate and Europe. Region(s): China (and Azerbajdzhan). Country or state(s): Belarus, Crimea (Ukraine), and Ukraine; Transcaucasus (Armenia, Azerbaijan & Georgia).

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

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, (.07)-.075-.1-(.115) mm in diam.. Margin: External filaments present (usually somewhat enlarged); uncinate (closely) or circinate, .75-2 µm long, (4)-6.5-8-(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 or c. 4 per ascus, spores (2)-3-4 per ascus, ellipsoid or ovoid; septa absent.

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