Erysiphe vernalis P. Karst.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-28); revised.

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

Type Information: Basionym: Erysiphe vernalis P. Karst. Type: Erysiphe vernalis P. Karst.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, polygonal;. Braun U., Beih. Nova Hedwigia 89: 1-700 [186-187] (1987).

Biogeography: Continent: Europe. Country or state(s): Finland and Sweden.

Ecology: Biotroph (mycelium scarce, conidial state unknown); phytopathogenic (mycelium scarce, conidial state unknown); growing on stems or inflorescences (on female catkins; 2: on young twigs). Host or Phorophyte Taxonomy: Alnus incana (L.) Moench; Alnus, Betulaceae.

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-.16 mm in diam.. Margin: External filaments present; interlaced with each other, mycelioid, straight, 2-5 µm long, 4-6 µm in diameter, hyaline, numerous, growing all across the lower half of the ascocarp, thin, not ramified, septate.

Asci: 8-15 asci per ascocarp, indistinctly stipitate or distinctly stipitate, 60-80 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid or ovoid, 16-18 µm long, 11-12 µm wide; septa absent.

Conidiomata: Hyphomycetous (conidial state unknown).

(report generated 04.Okt.2007)