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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-31). Data set reviewer(s): Schubert K. (06-03-01); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Uncinula geniculata W. R. Gerard; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula geniculata W. R. Gerard. Type: Uncinula geniculata W. R. Gerard.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells conspicuous, polygonal, ca. 10-15 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [532] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA: N.Y. to Ga., Ala., Kans.). Country or state(s): Illinois (USA), Kansas (USA), Missouri (USA), Indiana (USA), New York (USA), Ohio (USA), West Virginia (USA), Alabama (USA), Georgia (USA), and Virginia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (usually). Host or Phorophyte Taxonomy: Morus rubra L.; Morus, Moraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .09-.125 mm in diam.. Margin: External filaments present (often somewhat decreasing in width from base to top, especially the circinate part often narrowed towards the tip); uncinate (close or somewhat looser) or circinate, 1-2 µm long, 2.5-6-(7) µm in diameter, hyaline, numerous, 20-45 per mm², flexuose or geniculate (bent) (sometimes; abruptly bent in the upper half), smooth or rough, thin or moderatly thick (at the base), not ramified, aseptate or septate (0-1-septate).

Asci: 5-9 asci per ascocarp, not stipitate or indistinctly stipitate, 35-55 µm long, (25)-30-35-(40) µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 4-6-(7) per ascus, ellipsoid or ovoid, 18-24 µm long, 12-14 µm wide; septa absent.

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