Podosphaera collomiae (U. Braun) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

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

Type Information: Basionym: Sphaerotheca collomiae U. Braun.

Taxonomic Literature: Taxonomic notes: +conidiophores erect, foot-cells nearly cylindric, width sometimes
slightly increasing from base to top, sometimes somewhat constricted
at the base;
+ascocarp outer wall cells polygonal to irregular, ca.
8-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [118-119] (1987).

Biogeography: Continent: Northern America (USA, Canada). Region(s): North-western U.S.A., North-eastern U.S.A., and South-western U.S.A.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Polemoniaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious (often densely aggregated, forming dark brown patches or coats), (.065)-.07-.1-(.11) mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid (with constrictions, width irregular), .25-3 µm long, 4-11 µm in diameter, hyaline or sparsely pigmented (yellowish, sometimes pale brown), few or numerous, growing all across the lower half of the ascocarp, smooth or somewhat rough, thin, not ramified or ramified (seldom irregularly branched), septate.

Asci: Sub-globose, not stipitate, 50-80 µm long, 45-75 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid (oblong, shape and size of the spores variable), or nearly cylindrical, (14)-16-24 µm long, 10-17 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Not branched; basal cells 80-100 µm long, 11-15 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, 20-30 µm long, 12.5-20 µm wide.

(report generated 04.Okt.2007)