Podosphaera tridactyla var. pruni-ulmifoliae (Golovin) U. Braun

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-05-16); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Podosphaera pruni-ulmifoliae Golovin.

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.;Cleistothecia largely agreeing with those of var. tridactyla, but apex of the appendages always richly branched, 4-6 times, branchings compact, close, primary branches short. Braun U., Beih. Nova Hedwigia 89: 1-700 [158-160] (1987).

Biogeography: Continent: Asia-Temperate. Country or state(s): Kyrgyzstan (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves. Host or Phorophyte Taxonomy: Prunus ulmifolia Franch.; Prunus, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or 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); straight (more or less knob-like, not distinctly recurved), 1-6 µm long, 7-13 µm in diameter, hyaline or pigmented (brown in the lower half, paler or hyaline above, colour sometimes reaching the upper half), few, (1)-2-6-(8) per mm², growing on the upper half of the ascocarp (subfasciculate), 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), dichotomously branched, septate (mostly 1-6, septa throughout or only in the lower half).

Asci: 1 asci per ascocarp, sub-globose or broadly clavate, 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: Euoidium-type; not branched. Conidia: Macroconidial.

(report generated 04.Okt.2007)