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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-01-25); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera diffusa Cooke & Peck; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera diffusa Cooke & Peck. Type: Microsphaera diffusa Cooke & Peck.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, followed by 1-2 shorter cells;+ascocarp outer wall cells irregularly polygonal, ca. 10-25(-30) µm diam.;Appendages of forma diffusa (1-)1.5-2.5(-3) times as long as the cleistothecial diam., appendages of forma elongata 2-4.5 times the cleistothecial diam.. Braun U., Beih. Nova Hedwigia 89: 1-700 [326-327] (1987).

Biogeography: Continent: Asia-Temperate, Northern America (USA, Canada, generally distributed), and Southern America. Region(s): Far Eastern Asia and China. Country or state(s): Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Desmodium canadense (L.) DC.; Desmodium, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.065)-.075-.135 mm in diam.. Margin: External filaments present (horizontally spread); mycelioid or setiform, straight, (1)-1.5-2.5-(4.5) µm long, 6-11 µm in diameter, hyaline or faintly pigmented (at the base), numerous, 7-30 per mm², growing more or less between the lower and upper hald of the ascocarp or on the upper half of the ascocarp (occasionally), flexuose or stiff and straight (short appendages), smooth or faintly verrucose (rarely below), thin or thick (towards the base), ramified, dichotomously branched (3-6 times, branchings rather loose, diffuse, often deeply cleft, divergent, tips straight, not recurved, branchings early developed, apex mostly richly branched), aseptate or septate (1-3 septa near the base, septa occasionally remote from the base and coloured up to the middle of the stalk).

Asci: 4-10 asci per ascocarp, not stipitate or indistinctly stipitate, 40-70 µm long, 25-45-(50) µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-6 per ascus, ellipsoid or ovoid, 16-24 µm long, 9-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 25-38 µm long, 7.5-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial (length and width measured in dry state), not branched, 25-35 µm long, 11-17.5 µm wide; aseptate.

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