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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe thermopsis (U. Braun) U. Braun & S. Takam.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera thermopsis U. Braun. Type: Microsphaera thermopsis U. Braun.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [316-317] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Thermopsis lanceolata R. Br.; Thermopsis, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .08-.14 mm in diam.. Margin: External filaments present; interlaced with each other, straight, 1-3-(4) µm long, (4)-6-9-(10) µm in diameter, hyaline, numerous, 10-40 per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose or geniculate (bent) (to undulate, often strongly curved to nearly irregularly helicoid, shape extremely irregular), rough or verrucose (often), thin, moderatly thick (sometimes throughout, or thick-walled towards the base), or thick, not ramified or ramified, dichotomously branched (1-5 times, branchings diffuse, wide, often deeply cleft, occasionally (3) trichotomously branched, tips of the ultimate branchlets straight, not recurved) or trichotomously branched (occasionally), aseptate or septate (a single septum at the base).

Asci: 6-14 asci per ascocarp, not stipitate (subsessile) or indistinctly stipitate, 40-80 µm long, 25-45 µm wide; dehiscence unitunicate.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or doliiform; macroconidial, not branched, 35 µm long, 16 µm wide; aseptate.

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