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

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

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells conspicuous, large, (10-)15-45(-55)
µm diam., shape irregular;
+ascomata ext. fil. length
variable;
This variety differs from var. alpina by larger
ascospores, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [132-133] (1987).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America. Region(s): Siberia and Far Eastern Asia. Country or state(s): Austria, Germany, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia); 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, easily broken off); .5-6 µm long, (3.5)-4.5-10-(12) µm in diameter, pigmented (brown throughout when mature), few or numerous, 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, 18-30 µm long, 11-18 µm wide; septa absent; wall hyaline.

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.

(report generated 04.Okt.2007)