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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Sphaerotheca astilbicola (Z.Y. Zhao) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 8-25 µm
diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [112] (1987).

Biogeography: Continent: Asia-Temperate. Country or state(s): South-central China, North-central China, and Japan.

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

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)-.075-.095-(.1) mm in diam.. Margin: External filaments present; mycelioid or setiform (rather stiff, straight to curved, only some appendages flexuous, mycelioid), (.5)-1-4-(6) µm long, 4-9 µm in diameter, hyaline or pigmented (brown throughout when mature, very long appendages paler in the upper part, yellowish or hyaline), 8-30 per mm², growing at the ascocarp base, all across the lower half of the ascocarp, between the lower and upper hald of the ascocarp, or on the upper half of the ascocarp, flexuose or stiff and straight (rather), smooth or faintly rough, thin or thick (later, at least in the lower half), not ramified, not branched, septate.

Asci: 1 asci per ascocarp, sub-globose (often), not stipitate, 55-85 µm long, 45-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid, or ovoid, (15)-18-25-(27) µm long, (10)-12-16-(18) µm wide; septa absent; wall becoming pigmented, hyaline (to yellowish, with oil-drops and granules).

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