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Erysiphe carpini-laxiflorae U. Braun, Heluta & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-09-19).

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

Type Information: Basionym: Erysiphe carpini-laxiflorae U. Braun, Heluta & S. Takam.

Taxonomic Literature: Taxonomic notes: + hyphae branched, septate, 2.5-7 µm wide, hyaline, smooth, thin-walled; appressoria lobed, usually solitary, occasionally in opposite pairs, 4-8 µm diam.; chasmothecial peridium dark brown, multilayered, cells polygonal, rounded in outline to irregularly shaped (walls more or less sinuous), 8-20 µm diam.; anchor hyphae well-developed. Braun U. et al., Mycological Progress 5: 139-153 (2006).

Biogeography: Continent: Asia-Temperate. Country or state(s): Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves (ectophytic, forming distinct or effuse, thin, greyish white patches, inconspicuous on the lower leaf surface, often conspicuous above, evanescent to subpersistent), epiphyllous (mainly) or amphigenous. Host or Phorophyte Taxonomy: Carpinus laxiflora (Siebold & Zucc.) Blume; Carpinus, Corylaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (chasmothecia), orbicular (subglobose), scattered or in loose groups, (.065)-.075-.115 mm in diam.. Margin: External filaments present (1-2.5 times as long as the chasmothecial diam., width equal or nearly equal throughout or somewhat wider above); not interlaced, circinate (tightl; slightly enlargedy) or sub helicoid, 90-300 µm long, 4-6 µm in diameter, hyaline or pigmented (occasionally pigmented at the very base), numerous, 15-30-(35) per mm², growing between the lower and upper hald of the ascocarp, somewhat flexuose, stiff and straight (to curved or somewhat sinuous-geniculate, but not characteristically arched), or geniculate (bent), smooth or rough (particularly in the lower half), thin or thick (at the base, becoming gradually thinner towards the tip), not ramified, aseptate (0-1-septate) or septate.

Asci: 3-12 asci per ascocarp, globose (broadly ellipsoid-saccate, ovoid), not stipitate or indistinctly stipitate, 30-55 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, broadly ellipsoid or ovoid, 13-20 µm long, 7-12 µm wide; septa absent; wall hyaline (or subhyaline).

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched (solitary or occasionally two per cell, position more or less central between two septa, erect, foot-cells cylindrical, arising laterally from the supporting hyphae, curved at the very base, followed by (1)2 shorter cells); conidiophore cells 50-80 µm long, basal cells 5.5-7 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Obovoid, doliiform, or cylindrical; macroconidial (l/w ratio 1.5-2.5, with oil drops, germ tubes subterminal, short, with apical, lobed appressorium, conidium with a single germ tube or sometimes several germ tubes), not branched, 20-30 µm long, 9-14 µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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