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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-29).

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

Type Information: Basionym: Oidium baccharidis Havryl. & U. Braun. Type: Oidium baccharidis Havryl. & U. Braun.

Taxonomic Literature: Taxonomic notes: + hyphal appressoria well-developed, multilobed, single or opposite in pairs; +vegetative hyphae geniculate-sinuous, light brown, 4-7,5 µm wide. Havrylenko M. & Braun U., Nova Hedwigia 66: 513-522 (1998).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Baccharis racemosa (Ruiz & Pavon) DC.; Baccharis, Compositae.

Conidiophores: Euoidium-type (foot-cells cylindrical to barrel-shaped, increasing in diameter from base to top, with characteristically curved septum in the upper end, followed by two to four shorter or equally long cells); not branched; basal cells 22.5-44 µm long, 8-16 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid or doliiform; macroconidial, not branched, 24-32 µm long, 12-16 µm wide; aseptate.

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