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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised @EXCL@ not revised (02-03-07).

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Podosphaera biuncinata Cooke & Peck. Type: Podosphaera biuncinata Cooke & Peck.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, ca. 8-20 µm diam., small and inconspicuous;. Braun U., Beih. Nova Hedwigia 89: 1-700 [154] (1987).

Biogeography: Continent: Northern America (USA, New England to Ill., Miss. and southward; Canada).

Ecology: Biotroph; phytopathogenic; amphigenous. Host or Phorophyte Taxonomy: Hamamelidaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .06-.09 mm in diam.. Margin: External filaments present; 1.5-8 µm long, 4-8 µm in diameter, hyaline or pigmented (only at the very base), 4-15 per mm², growing between the lower and upper hald of the ascocarp, flexuose (and long), smooth, thin or moderatly thick (below), not ramified or ramified, dichotomously branched, aseptate or septate (0-1-septate).

Asci: 1 asci per ascocarp, sub-globose, not stipitate or indistinctly stipitate (seldom), 45-60 µm long, 30-55 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, 16-24 µm long, 9-16 µm wide; septa absent; wall thin (somewhat thicker below), remaining hyaline, hyaline, not ornamented (somewhat thicker below).

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