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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-01). Data set reviewer(s): Schubert K. (06-07-25); revised.

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

Type Information: Basionym: Oidium helichrysi Boesew. Type: Oidium helichrysi Boesew.

Taxonomic Literature: Taxonomic notes: +hyphae 6.2-7.5 µm wide; +appressoria indistinct;+conidiophores foot-cells followed by cells of 30-40 µm in length;+haustoria globose, 17.5-30 µm diam., mostly 20-25 µm;. Braun U., Beih. Nova Hedwigia 89: 1-700 [607-608] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (extensive, but thin). Host or Phorophyte Taxonomy: Helichrysum bracteatum; Helichrysum, Compositae.

Conidiophores: Euoidium-type; not branched (erect, 4-8-septate, straight); basal cells 150-250 µm long, 10-15 µm wide. Conidium Formation: Conidiogenous cells in chains (of 4-8). Conidia: Ellipsoid, ovoid, or cylindrical; macroconidial (germ tubes at an end, sometimes at a side, 6.2-7.5 µm wide), not branched, (35)-40-45-(71) µm long, (17.5)-20-22-(25) µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

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