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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Sphaerotheca aphanis var. hyalina U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascoc. outer wall cells 8-25 µm diam.;
+ascoc. ext. fil.
length 0.25-2.5 times as long as the cleistothecial diam., mostly
shorter than the cleistothecial diam. Braun U., Beih. Nova Hedwigia 89: 1-700 [104-106] (1987).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America. Region(s): Siberia.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, sub-scattered or gregarious, .07-.1 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid, (3)-3.5-6-(8) µm in diameter, hyaline or pigmented (yellowish below), few (mostly) or numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, septate.

Asci: 1 asci per ascocarp, 70-95 µm long, 55-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-8 per ascus, oval, 18-25 µm long, 12-18 µm wide; septa absent.

Conidiophores: Not branched or branched; conidiophore cells (0)-0-0-0-(0) µm long.

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