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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-02). Data set reviewer(s): Schubert K. (06-04-05); revised.

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

Type Information: Basionym: Phyllactinia elaeagni Linder. Type: Phyllactinia elaeagni Linder.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly shaped;. Braun U., Beih. Nova Hedwigia 89: 1-700 [590-591] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA: Oreg., Wyo.). Country or state(s): Oregon (USA) and Wyoming (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (scarce, inconspicuous). Host or Phorophyte Taxonomy: Elaeagnus argentea Pursh.; Elaeagnus, Elaeagnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (amphigenous). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.22)-.25-.28-(.285) mm in diam.. Margin: External filaments present (bulbous swelling ca. 40-55 µm diam.); not interlaced, straight, .75-1.25-(1.5) µm long, few, 6-12 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, not ramified.

Asci: At least 20 asci per ascocarp, distinctly stipitate, 70-90 µm long, 30-35 µm wide; dehiscence unitunicate (numerous, content often yellowish).

Ascospores: 1–2 per ascus, spores 2 per ascus, subglobose (sometimes), ellipsoid, or ovoid, 30-35 µm long, 19-24 µm wide; septa absent.

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