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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-22); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera aristolochiae Y. N. Yu, in Yu & Lai; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera aristolochiae Y. N. Yu. Type: Microsphaera aristolochiae Y. N. Yu.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, polygonal, ca. 10-15 x 8.8-12.5 µm;. Braun U., Beih. Nova Hedwigia 89: 1-700 [406-407] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous. Host or Phorophyte Taxonomy: Aristolochia heterophylla Hemsl.; Aristolochia, Aristolochiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .083-.115 mm in diam.. Margin: External filaments present (mostly about as long as the cleistothecial diam.); recurved (tips of the ultimate branchlets partly recurved, partly straight) or straight, .7-1.3-(1.8) µm long, 6.3-8.8 µm in diameter, sub-hyaline, few, 4-8-(13) per mm², growing between the lower and upper hald of the ascocarp, smooth or verrucose (seldom), thin (throughout, sometimes slightly thick-walled below) or moderatly thick, ramified, dichotomously branched (4-5(-6) times, branchings close and regular, tips obtuse or truncate, partly recurved, partly straight), aseptate or septate (0-1-septate).

Asci: 3-5 asci per ascocarp, not stipitate or indistinctly stipitate, 49-59 µm long, 44-54 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 5-8 per ascus, ellipsoid, 15-25 µm long, 10-15 µm wide; septa absent.

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