Podosphaera aphanis var. physocarpi (U. Braun) U. Braun & S. Takam.

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

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Sphaerotheca aphanis var. physocarpi U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Sphaerotheca aphanis physocarpi U. Braun.

Taxonomic Literature: Taxonomic notes: +the old, brown, infected shoots, leaves and fruits from the previous
season remain at the host plant and they are covered by overwintering
ascocarps, they are quite black with cleistothecia;
+ascoc. outer
wall cells obscure, polygonal to irregular, 6-25 µm
diam.;
+ascoc. ext. fil. length extremely variable, often rather
short, shorter than the cleistothecial diam., sometimes, however,
longer, up to 4 times the cleistothecial diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [104-106] (1987).

Biogeography: Continent: Northern America (USA: Mass. to Wisc. and Colo.; Canada).

Ecology: Biotroph; phytopathogenic; growing on leaves or inflorescences, amphigenous. Host or Phorophyte Taxonomy: Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, (.055)-.06-.085-(.09) mm in diam.. Margin: External filaments present; mycelioid, 3-8 µm in diameter, pigmented, growing all across the lower half of the ascocarp, smooth or rough (mostly; 1. rarely), thin, not ramified, septate.

Asci: 1 asci per ascocarp, not stipitate, 60-80 µm long, 50-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-8 per ascus, subglobose, ellipsoid, ovoid, or somewhat irregular, (16)-20-25-(28) µm long, 9.5-18 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Not branched or branched; conidiophore cells (0)-0-0-0-(0) µm long.

(report generated 04.Okt.2007)