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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-01-30).

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

Type Information: Basionym: Microsphaera ribicola Havryl. Type: Microsphaera ribicola Havryl.

Taxonomic Literature: Taxonomic notes: + vegetative hyphae 4 µm wide; peridium cells irregularly polygonal; conidiophores short, curved, foot cells cylindrical, slightly curved, followed by one shorter cell; appressoria nipple-shaped to slightly lobed. Havrylenko M., Mycotaxon 49: 257-267 (1993).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous. Host or Phorophyte Taxonomy: Ribes magellanicum Poir.; Ribes, Grossulariaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular (somewhat flattened in side view), forming independently from the host thallus or mycelium, scattered (and scarce), (.06)-.07-.12 mm in diam.. Margin: External filaments present; mycelioid or setiform, recurved (tips of the ultimate branchlets), 1 µm long, few or numerous, 12-14 per mm², growing between the lower and upper hald of the ascocarp, thick, ramified, dichotomously branched (5 to 6 times), septate (1-septate).

Asci: 4-8 asci per ascocarp, globose (broadly ellipsoid), not stipitate or indistinctly stipitate, 44-45 µm long, 32-38 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 5-6 per ascus, ellipsoid or ovoid, 18-20 µm long, 9-10-(12) µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 18-24 µm long, 6-10 µm wide. Conidium Formation: Conidiogenous cells Polygoni-type, single. Conidia: Cylindrical; macroconidial, not branched, 28-30 µm long, 10-12 µm wide; aseptate.

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