Podosphaera tridactyla (Wallr.) de Bary var. tridactyla

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

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Podosphaera oxyacanthae var. tridactyla (Wallr.) E. S. Salmon; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha tridactyla Wallr.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells long, followed by 1-2(-4) shorter cells;+appressoria nipple-shaped;+ascocarp outer wall cells irregularly shaped, ca. 6-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [158-160] (1987); Braun, U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Nearly cosmopolitan. Continent: Africa, Asia-Temperate, Australasia, Northern America (USA, Canada), Southern America, Pacific, and Asia-Tropical. Region(s): Siberia, Far Eastern Asia, China, Australia, and New Zealand. Country or state(s): Japan, Korea (North & South), and Taiwan; India; Washington (USA), Illinois (USA), Wisconsin (USA), Pennsylvania (USA), California (USA), and Georgia (USA); Bolivia and Northeastern Argentina (Argentina). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Padus avium Mill. (= Prunus padus L.); Prunus, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered and gregarious, (.06)-.07-.105-(.12) mm in diam.. Margin: External filaments present (length variable, unequal on the same ascocarp; outline of the stalk sometimes somewhat uneven, subundulate to subnodulose); recurved (seldom slightly) and straight (more or less knob-like, not distinctly recurved), 1-6 µm long, 7-13 µm in diameter, hyaline and pigmented (brown in the lower half, paler to hyaline above, colour sometimes reaching the upper half), few, (1)-2-6-(8) per mm², growing on the upper half of the ascocarp (subfaciculate), stiff and straight (or curved), smooth or faintly rough, thin, moderatly thick (stalk throughout, sometimes very thick below and thinner above), or thick, ramified ((1-)3-5(-6) times regularly branched, primary and secondary branches elongated, often horizontally spread, occasionally slightly recurved), dichotomously branched, septate (mostly 1-6, septa throughout or only in the lower half).

Asci: 1 asci per ascocarp, sub-globose or broadly clavate (ellipsoid-ovoid), not stipitate, 50-90 µm long, (40)-50-80 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid, or ovoid, 16-30 µm long, 9-20 µm wide; septa absent.

Conidiomata: Present; hyphomycetous (conidiophores erect, foot cells followed by 1-2-4 shorter cells).

Conidiophores: Euoidium-type; not branched; basal cells 60-160 µm long, 7-11 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 20-32 µm long, 13-18 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)