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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-09). Data set reviewer(s): Schubert K. (06-04-05); revised.

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

Type Information: Basionym: Uncinula prosopidis Speg. Type: Uncinula prosopidis Speg.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly shaped, ca. 5-15 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [573-574] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Prosopis campestris Griseb.; Prosopis, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .15-.23 mm in diam.. Margin: External filaments present (width throughout or somewhat narrowed upwards); uncinate (at first, loose to close, apical part often widely curved), circinate, or sub-helicoid, .75-1.5 µm long, (3)-4-6.5-(9) µm in diameter, hyaline, very numerous (densely crowded), 100-250 per mm², growing between the lower and upper hald of the ascocarp or somewhat on the upper half of the ascocarp, somewhat flexuose or stiff and straight (and straight), smooth, thin or thick (later throughout, often coalescent, sometimes irregularly thick), not ramified, aseptate.

Asci: 15-40 asci per ascocarp, narrowly clavate (usually), not stipitate (seldom) or distinctly stipitate, 50-85 µm long, 20-30 µm wide; dehiscence unitunicate (very numerous).

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 20-35 µm long, 11-18.5 µm wide; septa absent.

Conidiophores: Streptopodium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or cylindrical (occasionally somewhat narrowed centrally; primary conidia more or less lanceolate (-ovoid-oblong)); macroconidial (dimorphic, two types of conidia; germ tubes at an end, long and narrow), not branched, 40-64 µm long, 13.5-18.5 µm wide; aseptate.

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