Podosphaera alpina (S. Blumer) U. Braun & S. Takam. f. alpina

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: form. Synonyms: Sphaerotheca alpina f. alpina S. Blumer; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Sphaerotheca alpina f. alpina S. Blumer.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells consoicuous, large, (10-)15-45(-55)

µm diam., shape irregular;
+ascoc. ext. fil. length variable;. Braun U., Beih. Nova Hedwigia 89: 1-700 [132-133] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America. Region(s): Siberia and Far Eastern Asia. Country or state(s): Finland, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), and Romania; Japan.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous (often forming dark brown to nearly black patches or crust-like covers (together with the densely crowded ascocarps)). Host or Phorophyte Taxonomy: Saxifragaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.06)-.07-.095-(.105) mm in diam.. Margin: External filaments present (well developed, coarse); .5-6 µm long, (3.5)-4.5-10-(12) µm in diameter, pigmented (brown throughout when mature), few or numerous (easily broken off), smooth or rough (rarely), thin, not ramified or ramified, irregularly not branched, septate.

Asci: 1 asci per ascocarp, 50-85 µm long, 40-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose (often) or ovoid, 13-22 µm long, 10-16 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present; hyphomycetous.

Conidiophores: Oidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid or doliiform; macroconidial, not branched, 30-40 µm long, 15-26 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)