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Erysiphe trifolii var. intermedia (U. Braun) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-24). Data set reviewer(s): Schubert K. (06-03-28); not revised (00-08-04).

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera trifolii var. intermedia U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera trifolii var. intermedia U. Braun. Type: Microsphaera trifolii var. intermedia U. Braun.

Taxonomic Literature: Taxonomic notes: +conidiophores foot cells cylindric, sometimes curved or flexuous, followed by two shorter cells or cells of about the same length;+appressoria slightly lobed to multilobed;+ascomata outer wall cells irregularly polygonal, ca. 8-30 µm diam.;This variety differs from other varieties by appendage characters, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [291-294] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Northern hemispheric. Continent: Europe (exact distribution is still insufficiently known) and Northern America (USA, Canada).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Lupinus perennis L.; Lupinus, Leguminosae-Papilionoideae (on various host species of the genus Lupinus (cf. var. trifolii), exact host range is still insufficiently known).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (dorsiventral), orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.08)-.09-.15-(.18) mm in diam.. Margin: External filaments present (with a tendency to turn towards one direction); interlaced with each other (sometimes), straight, 2-6 µm long, 5-12.5 µm in diameter, hyaline or pigmented (occasionally coloured at the very base), few, 2-12 per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose, thin or thick (towards the base), not ramified, dichotomously branched, aseptate or septate (a single septum at the base).

Asci: 3-12 asci per ascocarp, not stipitate or indistinctly stipitate, 45-80 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-3-5-(6) per ascus, ellipsoid or ovoid, 18-30 µm long, 10-16 µm wide; septa absent.

(report generated 04.Okt.2007)

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