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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. (06-05-17); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Cystotheca phytoptophila (Kellerm. & Swingle) Golovin; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascoc. outer wall cells obscure, irregularly polygonal, ca. 8-20 µm diam., peridium very dark, inner wall composed of polygonal cells, yellowish to hyaline, easily separating from the outer wall;+ascoc. ext. fil. about as long as the cleistothec. diam. or shorter, rarely longer, often rudimentary;. Braun U., Beih. Nova Hedwigia 89: 1-700 [119-120] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA: central states to Kans. and Okla., Fla.; Canada). Country or state(s): Ontario (Canada), Iowa (USA), Kansas (USA), Missouri (USA), Oklahoma (USA), Indiana (USA), New York (USA), Ohio (USA), Pennsylvania (USA), West Virginia (USA), Florida (USA), Kentucky (USA), and North Carolina (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems, buds (on and between bud scales), causing the growth of galls (small, dense witches' brooms caused by proliferations of buds of Celtis occidentalis, in association with eriophid mites). Host or Phorophyte Taxonomy: Celtis occidentalis L.; Celtis, Ulmaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (mycelium and cinidial state scarce). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .06-.095 mm in diam.. Margin: External filaments present; not interlaced, mycelioid or setiform, straight, 1 µm long, 4-8 µm in diameter, pigmented (throughout, brown, or brown below and paler above), few, 0-10 per mm², growing all across the lower half of the ascocarp, stiff and straight, thin, not ramified, not branched (or irregulary) or irregular, septate.

Asci: 1 asci per ascocarp, not stipitate, 50-75 µm long, 40-65 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid or ovoid, 19-25 µm long, 9-15 µm wide; septa absent.

Conidiomata: Absent resp. not observed or present; hyphomycetous (conidial state scarce).

Conidiophores: Euoidium-type. Conidium Formation: Conidiogenous cells in chains. Conidia: Macroconidial, not branched; aseptate; with distintly visible fibrosin body fibrosin bodies.

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