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Erysiphe rhamnicola (Y. N. Yu) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera rhamnicola Y. N. Yu; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera rhamnicola Y. N. Yu. Type: Microsphaera rhamnicola Y. N. Yu.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 7-17 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [391] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Rhamnus rugulosa Hemsl.; Rhamnus, Fagaceae and Rhamnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .052-.083 mm in diam.. Margin: External filaments present (straight to curved); not interlaced, recurved (tips of the ultimate branchlets acuminate to obtuse, inflated, digitate or recurved), 1-1.5-(1.8) µm long, 7-10 µm in diameter, hyaline or pigmented (brown at the base), few, 3-6 per mm², stiff and straight (to curved), smooth, thin (above, thick-walled (3) towards the base) or thick, ramified, dichotomously branched ((2-)5-6 times, regularly branched, branchings rarely trichotomous (3), occasionallysomewhat irregular, tips of the ultimate branchlets acuminate to obtuse, inflated, digitate or recurved) or trichotomously branched, aseptate or septate (rarely, 1-2-septate).

Asci: 2-4 asci per ascocarp, not stipitate or indistinctly stipitate, 39-59 µm long, 29-44 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 7 per ascus, ellipsoid or ovoid, 13-20 µm long, 7-12 µm wide; septa absent.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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