Erysiphe fragilis (R. Y. Zheng & G. Q. Chen) U. Braun & S. Takam. [2001833]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set reviewer(s): Schubert K. (06-03-01); not revised (00-08-08).

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Uncinula fragilis R. Y. Zheng & G. Q. Chen; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula fragilis R. Y. Zheng & G. Q. Chen. Type: Uncinula fragilis R. Y. Zheng & G. Q. Chen.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, ca. 7-18 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [474-475] (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: Populus adenopoda Maxim.; Populus, Salicaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.11)-.14-.17-(.2) mm in diam.. Margin: External filaments present (width: sometimes narrowing towards the apex, 5.6-7.6 µm wide below, 2.5-4 µm wide above, outline somewhat irregular, slightly nodulose); circinate (closely), 1-1.7 µm long, 2.5-7.6 µm in diameter, hyaline, very numerous, 78-150 per mm², growing more or less between the lower and upper hald of the ascocarp, smooth, thin (throughout), not ramified, aseptate.

Asci: 10-18-(23) asci per ascocarp, not stipitate (seldom) or distinctly stipitate, 55.9-91.4 µm long, 40.6-53.3 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-7-8 per ascus, ellipsoid or ovoid (oblong-), 20.3-27.9-(30.5) µm long, 11.4-15.2 µm wide; septa absent.

(report generated 04.Okt.2007)