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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-05-16); revised.

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

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, followed by 2 shorter cells;+ascomata outer wall cells irregularly shaped, (10-)15-40(-50) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [138-139] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, Canada). Country or state(s): Arizona (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly). Host or Phorophyte Taxonomy: Asclepias sp.; Asclepias, Asclepiadaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .07-.11 mm in diam.. Margin: External filaments present (usually short, shorter than the cleistothecial diam. or about as long as the diam., often rudimentary, rarely longer than the diam.); mycelioid (shape and width irregular, with constrictons), straight, up to 1 µm long, 4.5-10 µm in diameter, hyaline (when narrow; brown when coarse) or pigmented, few (usually less than 10), growing all across the lower half of the ascocarp, smooth, thin, not ramified, septate.

Asci: 1 asci per ascocarp, not stipitate, 50-75 µm long, 45-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 (spores rarely developed, mostly immature) per ascus, spores 8 per ascus, subglobose or ellipsoid, 15-21 µm long, 12-16 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched; basal cells 50 µm long, 12.5 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or cylindrical; macroconidial, not branched, 28-32 µm long, 18-20 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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