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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Medusosphaera roseae Golovin & Gamalizk.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Medusosphaera rosae Golovin & Gamalizk. Type: Medusosphaera rosae Golovin & Gamalizk.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal to rounded, ca. 8-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [438] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China. Country or state(s): Kyrgyzstan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Rosa alberta Regel; Rosa, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .08-.15 mm in diam.. Margin: External filaments present (not uniform, two types: 8-25(-30) long equatorial appendages, about as long as the cleistothecial diam., undulate or irregularly spirally twisted, hyaline, smooth to rough, aseptate or few inconspicuous septa, thick-walled throughout, often coalescent, a second type of appendages in the upper half of the ascocarps, about 6-18, short, bristle-like, 25-70 x (2.5-)3.5-8(-10) µm, straight or somewhat curved, sometimes pointed, narrowed upwards, aseptate, verrucose, hyaline, thin-walled); straight, 6-8 µm in diameter, hyaline, numerous, 8-25-(30) per mm², growing between the lower and upper hald of the ascocarp (long appendages) or on the upper half of the ascocarp (short appandages), smooth, rough, or verrucose, thin (short appendages) or thick, not ramified (short appandages) or ramified, dichotomously branched (only the long equatorial appendages: 3-6 times, regularly, primary branches often somewhat elongated, the other branches short, stout, compact, tips of the ultimate branchlets knob-like, not recurved), aseptate or septate (few inconspicuous septa).

Asci: 6-20-(26) asci per ascocarp, distinctly stipitate, (50)-60-80-(85) µm long, (25)-30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (4)-6-8 per ascus, ellipsoid, ovoid, or sub-cylindrical, 15-23-(30) µm long, 9-12.5-(15) µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 28 µm long, 13 µm wide; aseptate.

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