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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-23); revised.

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

Type Information: Basionym: Erysiphe deserticola Speg. Type: Erysiphe deserticola Speg.

Taxonomic Literature: Taxonomic notes: +appressoria nipple-shaped to moderately lobed, single or oppsite in pairs;+conidiophores foot-cells straight, subcylindric, sometimes somewhat curved or flexuous, followed by 1-2 shorter cells;. Braun U., Beih. Nova Hedwigia 89: 1-700 [197] (1987).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous (mostly covering the entire surface of the leaves). Host or Phorophyte Taxonomy: Hoffmanseggia sp.; Hoffmanseggia, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .1-.15 mm in diam.. Margin: External filaments present (radiately spread); interwoven with surrounding mycelium, straight, few, growing at the ascocarp base, thin, not ramified.

Asci: Distinctly stipitate, 50-60 µm long, 25-35 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 or 12-16 (spores rather large) per ascus, spores 2-4 per ascus; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 20-30 µm long, 7-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, doliiform, or sub-cylindrical; macroconidial (shape and size variable), not branched, 25-40 µm long, (11)-13-20 µm wide; aseptate.

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