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Erysiphe trifolii var. desmanthi (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. desmanthi U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera trifolii var. desmanthi U. Braun. Type: Microsphaera trifolii var. desmanthi 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 the other varieties by smaller ascocarps, see below. The infections are usually caulicolous and the appendages are evidently verrucose. Braun U., Beih. Nova Hedwigia 89: 1-700 [291-294] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA). Country or state(s): Illinois (USA) and Mississippi (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems (usually). Host or Phorophyte Taxonomy: Desmanthus brachylobus Benth.; Desmanthus, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .07-.09-(.105) mm in diam.. Margin: External filaments present (evidently verrucose); interlaced with each other (sometimes), straight, 2-6 µm long, 5-12.5 µm in diameter, hyaline or pigmented (in the lower part), few, 2-12 per mm², growing more or less between the lower and upper hald of the ascocarp, stiff and straight (rather), verrucose, thin or moderatly thick (towards the base), not ramified, dichotomously branched, septate.

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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