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Erysiphe alchorneae (R. Y. Zheng & G. Q. Chen) U. Braun & S. Takam. var. alchorneae [2008526]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set reviewer(s): Schubert K. (06-03-29); revised.

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

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

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, distinct, ca. 10-28 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [481-482] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous. Host or Phorophyte Taxonomy: Alchornea sp.; Alchornea, Euphorbiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups (sometimes) or gregarious, (.095)-.11-.14-(.15) mm in diam.. Margin: External filaments present (width subequal or equal throughout); uncinate (closely), circinate, or sub-helicoid, 1-1.7 µm long, 5.6-8.9 µm in diameter, hyaline or pigmented (brown at the very base), numerous, (19)-23-35-(45) per mm², growing between the lower and upper hald of the ascocarp, flexuose (or straight to curved, fragile, rarely subnodulose), smooth or faintly rough, thin (throughout), not ramified, aseptate or septate (0-1-septate).

Asci: 5-8 asci per ascocarp, rarely indistinctly stipitate (subsessile) or distinctly stipitate, (50)-63.5-76.2 µm long, (38.1)-43.2-53.3 µm wide; dehiscence unitunicate.

Ascospores: c. 4 per ascus, spores 3-5 per ascus, ovoid (to ovoid-oblong), (20.3)-25.5-27.9-(30.5) µm long, (12)-15.2-17.8-(20.3) µm wide; septa absent; wall pale brown (faintly yellowish).

(report generated 04.Okt.2007)

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