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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-20).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Sphaerotheca ferruginea var. albiflorae Y. Nomura. Type: Sphaerotheca ferruginea var. albiflorae Y. Nomura.

Taxonomic Literature: Taxonomic notes: + cellulae peridii irregulariter angulatae, 17,5-22,5 × 15-20 µm. Nomura Y., Taxonomical study of Erysiphaceae of Japan. - 1-281 [38-39]. Tokyo (1997).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Sanguisorba albiflora (Makino) Makino; Sanguisorba, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (atro-brunneae), orbicular (globosa vel spheroidea), .09-.13 mm in diam.. Margin: External filaments present; mycelioid, straight, 100-110 µm long, hyaline or pigmented (brunneae, saepe ad apicem hyalinae), few or numerous, 12-26 per mm², growing on the upper half of the ascocarp, thin, not ramified (raro ramulis brevibus protuberationi similaribus), septate (4-9 septa).

Asci: 1 asci per ascocarp, globose (late ovatus vel subglobosus), not stipitate, 67-78 µm long, 62-73 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose or ovoid, 17-25 µm long, 12-15 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched (conidiophores e hyphis repentibus exorientia, recta vel interdum ad basim curvata et aliquanthum constricta, 1-2-septata); conidiophore cells 70-120 µm long, basal cells 10-15 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ovoid; macroconidial, not branched, 30-42 µm long, 16-23 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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