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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-22); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera ceanothi (Schwein.) U. Braun.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe ceanothi Schwein. Type: Erysiphe ceanothi Schwein.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [401-402] (1987).

Biogeography: Continent: Northern America (USA, throughout the entire distribution area of the host).

Ecology: Biotroph; phytopathogenic; growing on leaves or fruits, amphigenous. Host or Phorophyte Taxonomy: Ceanothus americanus L.; Ceanothus, Rhamnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .075-.11 mm in diam.. Margin: External filaments present; recurved, 1-2 µm long, 7-11 µm in diameter, hyaline or pigmented (at the very base (sometimes one quarter of the stalk brown)), few, 4-15 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth or rough, thin or thick (towards the base), ramified, dichotomously branched ((3-)4-5(-6) times closely and regularly, tips recurved, rarely primary branches elongated), aseptate or septate (0-1-septate).

Asci: 3-5 asci per ascocarp, not stipitate or indistinctly stipitate, 40-55 µm long, 35-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 4-7 per ascus, subglobose, ellipsoid, or ovoid, 15-21 µm long, 9-13 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial (length and width measured in dry state !), not branched, 25-30 µm long, 12-16 µm wide; aseptate.

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