Erysiphe crataegi (Bunkina) U. Braun & S. Takam. [2018433]

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

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

Type Information: Basionym: Uncinula crataegi Bunkina. Type: Uncinula crataegi Bunkina.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells rather regularly polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [490] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): Far Eastern Asia (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (infections very insconspicuous). Host or Phorophyte Taxonomy: Crataegus maximowiczii C.K.Schneid.; Crataegus, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .145-.18 mm in diam.. Margin: External filaments present (width subequal throughout or mostly somewhat increasing upwards); uncinate (at first, later closely circinate to subhelicoid, hooked part not enlarged or rarely slightly enlarged (-12 µm)), circinate, or helicoid, 1 µm long, 4.5-8-(9.5) µm in diameter, hyaline, numerous, 45-150 per mm², growing between the lower and upper hald of the ascocarp, flexuose (substraight, curved, moderately undulate to geniculate) or geniculate (bent), smooth or rough (below), thin (throughout), not ramified, aseptate.

Asci: 6-12 asci per ascocarp, distinctly stipitate (mostly), 60-95 µm long, 30-55 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-8 per ascus, ellipsoid or ovoid, (16)-18-29 µm long, 9-16 µm wide; septa absent.

(report generated 04.Okt.2007)