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Golovinomyces immersus (U. Braun) V. P. Gelyuta

Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-29); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe immersa U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe immersa U. Braun. Type: Erysiphe immersa U. Braun.

Taxonomic Literature: Taxonomic notes: +conidiophores erect, very long, width increasing from base to top, fragments of the conidiophores 200-300 µm long, foot cells followed by very long cells;+ascocarp outer wall cells irregularly shaped, obscure, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [257-258] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Eremocarpus setigerus (Hook.) Benth.; Eremocarpus, Euphorbiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (in the dense tomentum of the host leaves), scattered or in loose groups, (.095)-.12-.15-(.165) mm in diam.. Margin: External filaments present (short, about as long as the cleistothecial diam. or mostly shorter, often very short); interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, up to 1 µm long, 3.5-9 µm in diameter, hyaline or faintly pigmented (yellowish to brownish), numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, septate.

Asci: 10-25 asci per ascocarp, distinctly stipitate, 60-90 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, subglobose, ellipsoid, or ovoid, 19-26.5 µm long, 12-18 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Euoidium-type; not branched; basal cells 50-80 µm long, 9-14.5 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 24-40 µm long, 15-24 µm wide; aseptate.

(report generated 04.Okt.2007)

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