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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-20).

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

Type Information: Basionym: Erysiphe pusilla Tanda & Y. Nomura. Type: Erysiphe pusilla Tanda & Y. Nomura.

Taxonomic Literature: Taxonomic notes: + cleistothecia: cellulae peridii irregulariter polygonales, 11-18 × 7-13 µm. Nomura Y., Taxonomical study of Erysiphaceae of Japan. - 1-281 [172-173]. Tokyo (1997).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Chrysosplenium ramosum Maxim.; Chrysosplenium, Saxifragaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (atro-brunnea), orbicular (globosa vel depressi-globosa), scattered, .058-.076 mm in diam.. Margin: External filaments present; mycelioid, straight (prope apicem 3,9-5,2 µm latae), 54-198 µm long, 6.2-8 µm in diameter, hyaline or pigmented (atro-brunneae, apicem versus pallidi-brunneae vel hyalinae), few, 4-10 per mm², growing between the lower and upper hald of the ascocarp, flexuose (vel curvatae), smooth, thin, not ramified, aseptate (0-3-septatae) or septate.

Asci: 2-4 asci per ascocarp, globose (late ellipsoidei, ovati, subglobosi vel globosi), not stipitate or indistinctly stipitate, 36-54-(61) µm long, 29-43-(50) µm wide; dehiscence unitunicate.

Ascospores: c. 4 per ascus, spores 3-4 per ascus, subglobose, ellipsoid, or ovoid, 13-19 µm long, 8-10 µm wide; septa absent; wall hyaline.

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