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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 ferruginea (Schltdl. : Fr.) L. Junell; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric;
+ascoc. outer wall cells
irregularly polygonal;
+ascoc. ext. fil. straight, often widely
curved;. Braun U., Beih. Nova Hedwigia 89: 1-700 [126] (1987).

Biogeography: Continent: Africa, Asia-Temperate, Europe, and Northern America (USA, Canada, Alaska). Region(s): Siberia, Far Eastern Asia, and China. Country or state(s): Canary Islands (Spain) (and Balearic Islands); Japan.

Ecology: Biotroph; phytopathogenic; growing on stems, petioles, or leaves, amphigenous. Host or Phorophyte Taxonomy: Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious (often densely grouped and forming dark patches), .075-.1-(.105) mm in diam.. Margin: External filaments present; setiform, 1-6-(7.5) µm long, (4)-5-10 µm in diameter, pigmented (throughout when mature, brown, often dark), numerous, growing on the upper half of the ascocarp (at least partly), thin or moderatly thick (mostly, at least below), not ramified, septate.

Asci: 1 asci per ascocarp, 50-80 µm long, 40-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose or ellipsoid, (16)-18-28-(30) µm long, 11-20 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiophores: Oidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Macroconidial, not branched, 25-30 µm long, 14-18 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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