Podosphaera pannosa (Wallr.) de Bary

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-05-17); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Sphaerotheca pannosa (Wallr. : Fr.) Lév.; Erysiphe pannosa (Wallr.) Fr.; Oidium leucoconium Desm.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha pannosa Wallr.

Taxonomic Literature: Taxonomic notes: +conidiophores foot cells straight, nearly cylindric, ca. 45-80 x 7.5-12 µm, followed by 1-2 shorter cells;+appressoria +/- nipple-shaped;+the persistent secondary mycelium is dense and pannose, patches, sometimes effused, forming a white to greyish, sometimes greyish brown felt, consisting of rather coarse, sparsely branched, thick-walled hyphae, ca. 4.5-8 µm wide;+ascoc. outer wall cells irregularly polygonal to rounded, ca. 8-25 µm diam.;+scoc. ext. fil. often very short, shorter than the cleistothecial diam., sometimes rudimentary, or appendages longer, 0.5-2 times the cleistothecial diam., rarely exceeding;. Braun U., Beih. Nova Hedwigia 89: 1-700 [107] (1987).

Biogeography: Cosmopolitan. Country or state(s): Hawaii (USA); Idaho (USA), Montana (USA), Oregon (USA), Washington (USA), North Dakota (USA), Oklahoma (USA), South Dakota (USA), New Jersey (USA), New York (USA), California (USA), Alabama (USA), Arkansas (USA), Florida (USA), Georgia (USA), Mississippi (USA), and North Carolina (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, sepals, or fruits, causing the growth of galls (infected shoots often disfigured and distorted, infections on leaves usually less conspicuous, often without deformations). Host or Phorophyte Taxonomy: Rosa villosa L.; Rosa, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging, more or less gregarious, .07-.115-(120) mm in diam.. Margin: External filaments present; interlaced with each other, mycelioid (often characteristically undulate-contorted), straight, .5-2 µm long, 3-8 µm in diameter, hyaline or pigmented (later, yellowish to brown below, paler upwards), few (usually), growing all across the lower half of the ascocarp, flexuose, smooth or faintly rough, thin or moderatly thick (seldom), not ramified, not branched, septate.

Asci: 1 asci per ascocarp, not stipitate, 70-100 µm long, 50-80 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (4)-8 per ascus, ellipsoid, ovoid, or doliiform, 16-28-(31) µm long, 9-18 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Euoidium-type; not branched; basal cells 45-80 µm long, 7.5-12 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 20-33 µm long, 12-19 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)