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Leveillula clavata Nour

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-31). Data set reviewer(s): Schubert K. (06-04-04); revised.

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

Type Information: Basionym: Leveillula clavata Nour. Type: Leveillula clavata Nour.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly shaped;. Braun U., Beih. Nova Hedwigia 89: 1-700 [563-564] (1987).

Biogeography: Continent: Africa. Country or state(s): Kenya (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Euphorbia pulcherrima Willd. ex Klotzsch; Euphorbia, Euphorbiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious, (.12)-.145-.195-(.2) mm in diam.. Margin: External filaments present (the mature appendages are gradually expanded in width from base to top, the upper parts of the appendages swell up in water and sometimes they dissolve); interlaced with each other or interwoven with surrounding mycelium (often forming a dense felt around the ascocarps), mycelioid, straight, .8-1 µm long, 3.5-8 µm in diameter, hyaline, numerous, growing all across the lower half of the ascocarp or between the lower and upper hald of the ascocarp, smooth, thin, not ramified or ramified (rarely irregularly branched), irregular, aseptate or septate (few inconspicuous septa).

Asci: 30 asci per ascocarp, distinctly stipitate, 50-65 µm long, 20-30 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 18-26 µm long, 11-14 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Oidiopsis-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: More or less clavate; macroconidial, not branched, 45-65 µm long, 14-18 µm wide; aseptate.

(report generated 04.Okt.2007)

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