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Erysiphe brachystegiae Doidge [2018593]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-02-28); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Uncinula brachystegiae (Doidge) Piroz.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe brachystegiae Doidge. Type: Erysiphe brachystegiae Doidge.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregular, with unevenly thickened walls;. Braun U., Beih. Nova Hedwigia 89: 1-700 [461-462] (1987).

Biogeography: Continent: Africa. Country or state(s): Malawi and Zambia (and Rhodesia).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Brachystegia randii Baker f.; Brachystegia, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (hemispherical, becoming flattened), orbicular, forming independently from the host thallus or mycelium, scattered, .18-.3 mm in diam.. Margin: External filaments present (up to 1700 µm long); recurved or straight, 3-7 µm long, 4.5-6-(8) µm in diameter, hyaline, numerous, 25-35-50 per mm², growing between the lower and upper hald of the ascocarp, flexuose (or straight), smooth, thin (at first thin-walled throughout with the apex straight and blunt, becoming thick-walled, sometimes nearly confluent, except just below the apex where the appendages remain thin-walled, apex, however, thick-walled, somewhat expanded, 6-8 µm) or thick, not ramified, aseptate.

Asci: Up to 60 asci per ascocarp, indistinctly stipitate (shortly stalked), 75-100 µm long, 35-55 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 5-8-8 per ascus, ellipsoid, pyriform, or reniform, 22-30 µm long, 11-17.5 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial, not branched, 27-40 µm long, 11-18 µm wide; aseptate.

(report generated 04.Okt.2007)

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