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Erysiphe izuensis (Y. Nomura) 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. (06-01-31); revised.

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

Type Information: Basionym: Microsphaera izuensis Y. Nomura. Type: Microsphaera izuensis Y. Nomura.

Taxonomic Literature: Taxonomic notes: +appressoria lobed, single or opposite in pairs;+conidiophores foot-cells straight or somewhat flexuous, followed by 1-2 shorter cells, the second cell sometimes about as long as the foot-cell;+ascomata outer wall cells irregularly polygonal, 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [362-363] (1987); Chen Z. X. & Yao Y. J., Wuyi Sci. J. 8: 157-161 (1991).

Biogeography: Continent: Asia-Temperate. Region(s): Far Eastern Asia and China (Fujian Prov.). Country or state(s): Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Rhododendron macrosepalum Maxim.; Rhododendron, Ericaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .07-.135 mm in diam.. Margin: External filaments present; mycelioid or setiform, recurved or straight (tips of the ultimate branchlets at first straight, but recurved when fully mature), (1)-1.5-2.5-(3.5) µm long, 5-10-(18) µm in diameter, hyaline or pigmented (often yellowish to brown below), numerous, (6)-10-20-(29) per mm², growing more or less between the lower and upper hald of the ascocarp or on the upper half of the ascocarp (somewhat), flexuose, stiff and straight (straight, but frequently curved, regular or rather irregular, geniculate or rather undulate), or geniculate (bent), verrucose, thin, moderatly thick, or thick (towards the base; stalk sometimes moderately thick-walled throughout), ramified, dichotomously branched ((2-)3-5(-6) times, branchings loose and wide, regular to irregular, primary and secondary branches elongated, occasionally somewhat closer, compact, branches of the higher order often somewhat recurved, tips of the ultimate branchlets at first straight, but recurved when fully mature), aseptate or septate (with 1-2 septa near the base, very rarely 3 septa).

Asci: (2)-3-6 asci per ascocarp, not stipitate or indistinctly stipitate, 50-85 µm long, 40-60-(65) µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-8 per ascus, ellipsoid or ovoid, (14)-18-30 µm long, (10)-11-20 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; conidiophore cells 60-110 µm long, basal cells 7-12 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid; macroconidial, not branched, 37-47 µm long, 17-20 µm wide; aseptate.

(report generated 04.Okt.2007)

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