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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 or basionymous. Taxonomic rank: species. Synonyms: Uncinula celtidis Shvartsman & Kusnezowa; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula celtidis Shvartsman & Kusnezowa. Type: Uncinula celtidis Shvartsman & Kusnezowa.

Taxonomic Literature: Taxonomic notes: +appressoria multilobed;+ascomata outer wall cells irregularly polygonal, obscure, ca. 8-30 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [508-509] (1987).

Biogeography: Continent: Asia-Temperate (Armenia, Central Asia). Country or state(s): Kazakhstan and Transcaucasus (Armenia, Azerbaijan & Georgia); India (maybe) and Pakistan (maybe).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Celtis caucasica Willd.; Celtis, Ulmaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (usually epiphyllous). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.075)-.08-.12 mm in diam.. Margin: External filaments present (about 2/3-3/4 of the stalk is subequal in width or even slightly decreasing upwards; gradually expanded towards the apex; hooked part not or only very slightly enlarged, often enlarged at the very base (-13 µm)); uncinate (closely), circinate, or sub-helicoid, (1)-1.5-2 µm long, 4.5-6.5-(13) µm in diameter, hyaline, numerous, 8-20 per mm², growing between the lower and upper hald of the ascocarp, flexuose (usually; straight to curved, sometimes geniculate or subundulate), stiff and straight, or geniculate (bent), verrucose (especially in the lower half), thin or thick (towards the base), not ramified, aseptate or septate (0-1-septate).

Asci: 2-6 asci per ascocarp, not stipitate or indistinctly stipitate, 35-65 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (4)-5-7-(8) per ascus, ellipsoid, ovoid, or sub-cylindrical, 17-25 µm long, (8.5)-10-14.5 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial, not branched, 22.4-25.6 µm long, 16 µm wide; aseptate.

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