Podosphaera leucotricha (Ellis & Everh.) E. S. Salmon

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

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

Type Information: Basionym: Sphaerotheca leucotricha Ell. & Ev.

Taxonomic Literature: Taxonomic notes: +appressoria nipple-shaped;
+conidiophores foot-cells cylindric,
followed by 1-3 shorter cells;
+ascomata outer wall cells
irregularly polygonal, ca. 8-20 µm diam.;
+basal hyphae often
present, even in mature ascocarps (?);. Braun U., Beih. Nova Hedwigia 89: 1-700 [162-164] (1987).

Biogeography: Cosmopolitan (nearly). Continent: Africa, Asia-Temperate, Australasia, Northern America, Southern America, Pacific, and Asia-Tropical.

Ecology: Biotroph; phytopathogenic; growing on fruits, stems, leaves, or inflorescences, amphigenous, causing the growth of galls (infected leaves often disfigured or distorted). Host or Phorophyte Taxonomy: Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (in the dense mycelial layer), sub-scattered or gregarious, .07-.105 mm in diam.. Margin: External filaments present; mostly setiform, 3-7 µm long, 6-10 µm in diameter, hyaline or pigmented (brown below and paler or hyaline above), 3-10 per mm², growing on the upper half of the ascocarp (fasciculate), flexuose or stiff and straight (and straight or curved), smooth or faintly rough, thin (above), not ramified or ramified, not branched or dichotomously branched (1-2 (-3) times, occasionally; branchings wide, tips straight), septate.

Asci: 1 asci per ascocarp, globose or clavate, 60-80 µm long, 45-60 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid, sub-cylindrical, ovoid, or curved (sometimes slightly), 20-30 µm long, 12-17.5 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present; hyphomycetous (conidiophores erect foot cells cylindric, followed by 1-3 shorter cells).

Conidiophores: Oidium-type; not branched; basal cells (35)-40-55-(75) µm long, 9-12.5 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Broadly ellipsoid or ovoid; macroconidial (germ tubes on a side or end of the conidia, simple, straight, short to moderately long, terminating in an unlobed appressorium), not branched, 20-30 µm long, (12)-14-18-(20) µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)