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Podosphaera spiraeae (Sawada) 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. (06-05-16); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Sphaerotheca spiraeae Sawada; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Sphaerotheca spiraeae Sawada.

Taxonomic Literature: Taxonomic notes: +conidiophores foot cells basal septum often somewhat away from the branching point of the mycelium;+ascoc. outer wall cells irregularly polygonal, peridium dark, cells ca. 6-25 µm diam.;+ascoc. ext. fil. straight or mostly curved;+ascus easily swelling in water to a size that is exceeding the cleistothecial diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [124-126] (1987).

Biogeography: Continent: Asia-Temperate, Europe, Northern America, and Asia-Tropical. Region(s): Siberia and China. Country or state(s): Japan; Pakistan; Ontario (Canada), Connecticut (USA), Indiana (USA), Michigan (USA), New York (USA), Pennsylvania (USA), Vermont (USA), and Texas (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous, causing the growth of galls (strongly infected stems frequently disfigured and distorted). Host or Phorophyte Taxonomy: Spiraea thunbergii Siebold; Spiraea, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, usually gregarious, .07-.105 mm in diam.. Margin: External filaments present; often setiform, straight, 1-5 µm long, 4-12 µm in diameter, pigmented (dark brown throughout when fully mature), numerous, 5-25 per mm², growing between the lower and upper hald of the ascocarp or on the upper half of the ascocarp, flexuose or stiff and straight (and coarse), smooth, thin or moderatly thick (especially in the lower half), not ramified, septate.

Asci: 1 asci per ascocarp, not stipitate or indistinctly stipitate, 65-95 µm long, 50-85 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, (16)-18-29-(34) µm long, 12-22-(25) µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Euoidium-type; not branched; basal cells 65-95 µm long, 8-14 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: More or less ellipsoid; macroconidial, not branched, 30-35 µm long, 16-20 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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