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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. (06-01-24); not revised (02-02-25).

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

Type Information: Basionym: Sphaerotheca lanestris Harkn. Type: Sphaerotheca lanestris Harkn.

Taxonomic Literature: Taxonomic notes: +the mycelium forms long, filiform aerial hyphae, they are rather thick-walled, smooth, aseptate, seldom few septa below, hyalinem ca. 3-5.5 µm wide, flexuous;+ascom. wall composed of two layers which easily seperate from each other, outer cells irregularly polygonal, ca. 8-20 µm diam., inner cells regularly polygonal, ca. 10-18 µm diam. Braun U., Beih. Nova Hedwigia 89: 1-700 [94-95] (1987).

Biogeography: Continent: Asia-Temperate, Australasia, Northern America, and Asia-Tropical. Region(s): China, South-western U.S.A., South-Central U.S.A., South-eastern U.S.A., and North and Central Mexico. Country or state(s): Japan, Korea (North & South), and Taiwan; India and Pakistan; Illinois (USA), Iowa (USA) (seems to be the northern limit in the USA), California (USA), Alabama (USA), Mississippi (USA), and North Carolina (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Quercus agrifolia; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered (subscattered) or gregarious, .075-.11-(.12) mm in diam.. Margin: External filaments present; interlaced with each other, mycelioid, straight, 4-5 µm in diameter, hyaline or pigmented, few (very short, often rudimentary or nearly absent), growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, not branched, aseptate or septate.

Asci: 1 asci per ascocarp, not stipitate or indistinctly stipitate, 75-100-(130) µm long, 50-70-(80) µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 22-32 µm long, 13-21.5 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Doliiform; macroconidial, not branched, 26-36 µm long, 12-22 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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