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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 or basionymous. Taxonomic rank: variety. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe sparsa var. euphorbiicola Havryl. Type: Erysiphe sparsa var. euphorbiicola Havryl.

Taxonomic Literature: Taxonomic notes: +peridium with polygonal cells, thick-walled, 6-16 µm diam.; +appressoria nipple-shaped, with crenulate margins to slightly lobed; +vegetative hyphae flexuous to geniculate, 3-7 µm wide. Havrylenko M., Nova Hedwigia 63: 71-79 (1996).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Euphorbia collina var. nahuelhuapina (Croizat) Subils; Euphorbia, Euphorbiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups, .086-.13 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium (appandages and surrounding mycelium forming dense circular mats around each ascoma), mycelioid (mostly ribbon-like), straight, 1-2 µm long, 4-10 µm in diameter, hyaline or pigmented (turning yellow to brown when mature), numerous, growing all across the lower half of the ascocarp, smooth, thin, not ramified, septate (1-2-septate).

Asci: 8-14 asci per ascocarp, indistinctly stipitate, 52-69 µm long, 24-32 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 24-32 µm long, 8-17 µm wide; septa absent.

Conidiophores: Euoidium-type (foot-cells cylindrical to curved in the basal half and gradually increasing in diameter from base to top); not branched; conidiophore cells 31-61 µm long, basal cells 10-16 µm long. Conidium Formation: Conidiogenous cells in chains. Conidia: Cylindrical; macroconidial (germ tubes apical and simple), not branched, 27-37 µm long, 12-15 µm wide; aseptate.

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