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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-29).

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

Type Information: Basionym: Erysiphe balbisiae Havryl. Type: Erysiphe balbisiae Havryl.

Taxonomic Literature: Taxonomic notes: +peridium thin, composed of irregularly shaped cells, 8-16 µm diam.; +appressoria well-developed, nipple-shaped, alternate or opposite; +vegetative hyphae branched at right angles, geniculate, 2,5-6 µm wide. Havrylenko M., Nova Hedwigia 63: 71-79 (1996).

Biogeography: Continent: Southern America (Argentina, Prov. Neuquen & Prov. Rio Negro).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Balbisia gracilis (Meyen) Hunz. & Ariza; Ledocarpaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular (depressed globose, some with irregular outline), forming independently from the host thallus or mycelium, gregarious, .1-.14 mm in diam.. Margin: External filaments present; not interlaced, mycelioid, straight, 1-5 µm long, 5-6 µm in diameter, hyaline, numerous, 18-20 per mm², growing between the lower and upper hald of the ascocarp, geniculate (bent), smooth, thin, not ramified, aseptate or septate (some with one septum).

Asci: 11-15 asci per ascocarp, distinctly stipitate, 60-80 µm long, 24-34 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 4-5-6 per ascus, mostly ovoid or cylindrical, 22-29 µm long, 10-14 µm wide; septa absent.

Conidiophores: Pseudoidium-type (foot-cells cylindrical, flexuous, sometimes twisted, followed by two unequal shorter cells); not branched; basal cells 81-140 µm long, 6.5-10 µm wide. Conidium Formation: Conidiogenous cells single or in chains (occasionally in short chains). Conidia: Ellipsoid (to slightly lanceolate); macroconidial, not branched, 32-40 µm long, 12-15 µm wide; aseptate.

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