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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. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera sydowiana U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera sydowiana U. Braun. Type: Microsphaera sydowiana U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [369] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA). Country or state(s): Idaho (USA) and Washington (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Ceanothus velutinus Douglas; Ceanothus, Rhamnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .08-.13 mm in diam.. Margin: External filaments present; recurved, (1)-1.5-3 µm long, 6-11 µm in diameter, hyaline or faintly pigmented (at the very base), numerous, 6-22 per mm², growing between the lower and upper hald of the ascocarp, flexuose, smooth or rough, thin or moderatly thick (towards the base), ramified, dichotomously branched (4-5 times, branchings regular, tips distinctly recurved, primary branches sometimes somewhat elongated, stalk occasionally forked in the lower half), aseptate or septate (0-1-septate).

Asci: 3-8 asci per ascocarp, indistinctly stipitate, 40-55 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-6 per ascus, subglobose, ellipsoid, or ovoid, 16-22 µm long, 10-14 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or doliiform; macroconidial, not branched, 25-35 µm long, 14-16 µm wide; aseptate.

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