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Podosphaera macularis (Wallr.) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-05-19); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Sphaerotheca macularis (Wallr. : Fr.) Lind; Erysiphe macularis (Wallr.) Fr.; Erysiphe humuli DC.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha macularis Wallr.

Taxonomic Literature: Taxonomic notes: +appressoria indistinct, sometimes nipple-shaped;+conidiophores erect;+conidiophores foot-cells cylindric, followed by 1-3 shorter cells;+ascocarp outer wall cells irregularly polygonal, 8-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [113-114] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Europe (all), Northern America (USA, Canada), and Southern America. Region(s): Southern Africa, Siberia, Far Eastern Asia, and China. Country or state(s): Ontario (Canada), Wisconsin (USA), Connecticut (USA), New York (USA), California (USA), and New Mexico (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (leaves covered by numerous limited white patches, characteristically maculate). Host or Phorophyte Taxonomy: Humulus lupulus L.; Humulus, Cannabaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (mostly hypophyllous). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious (groups of ascocarps and coloured hyphae often forming dark patches on the leaves), .07-.11 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid (sometimes), straight, .5-6 µm long, (2.5)-4-8-(10) µm in diameter, pigmented (throughout when mature, brown or yellowish), numerous (usually), growing all across the lower half of the ascocarp or on the upper half of the ascocarp (partly), flexuose, smooth, thin, not ramified, septate.

Asci: 1 asci per ascocarp, not stipitate, 60-90 µm long, 50-80 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to 12-16 (ascospores of 2- or 4-spored asci larger) per ascus, spores (2)-4-8 per ascus, ellipsoid or ovoid, 16-24-(30) µm long, 11-18-(21) µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Euoidium-type; not branched; basal cells 40-70 µm long, 9-11 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or cylindrical; macroconidial, not branched, 20-33 µm long, 13-20 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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