Podosphaera myrtillina var. major Juel

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: variety. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Podosphaera myrtillina var. major Juel. Type: Podosphaera myrtillina var. major Juel.

Taxonomic Literature: Taxonomic notes: This variety differs from var. myrtillina by longer appendages, see

below;
+ascocarp outer wall cells conspicuous, irregularly
polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [152-154] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (Canada, Alaska). Region(s): Siberia and Far Eastern Asia. Country or state(s): Denmark, Finland, United Kingdom, Iceland, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

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

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered (usually), .07-.09 mm in diam.. Margin: External filaments present; 5-10 µm long, pigmented (brown in the lower half, pale brown, yellowish or nearly hyaline in the upper part), few, (3)-5-8-(10) per mm², growing between the lower and upper hald of the ascocarp or on the upper half of the ascocarp (somewhat), flexuose, moderatly thick, not ramified, septate.

Asci: 1 asci per ascocarp, sub-globose, not stipitate, 60-85 µm long, 50-80 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, subglobose, ellipsoid, or ovoid, 20-30 µm long, 10-19 µm wide; septa absent.

Conidiomata: Present (poorly developed); hyphomycetous.

Conidiophores: Oidium-type. Conidia: Macroconidial, not branched, 27-35 µm long, 14-18 µm wide; aseptate.

(report generated 04.Okt.2007)