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

Type Information: Basionym: Oidium reginae Havryl. & S. Takam. Type: Oidium reginae Havryl. & S. Takam.

Taxonomic Literature: Taxonomic notes: + vegetative hyphae septate, branching at right or narrow angles, 5-8(-9) µm wide, 50-60 µm long, with thick rough walls; appressoria nipple-shaped, slightly lobed to hooked, single or opposite in pairs. Takamatsu S., Matsuda S., Niinomi S. & Havrylenko M., Mycological Research 110: 1097 (2006).

Ecology: Biotroph; phytopathogenic; growing on leaves (and young shoots; persistent, forming white-grey patches), on all leaf nerves (main veins) or on tendrils, mostly hypophyllous or amphigenous. Host or Phorophyte Taxonomy: Mutisia decurrens Cavanilles; Mutisia, Compositae.

Conidiophores: Euoidium-type (Oidium subgen. Reticuloidium); not branched (erect, single on a hyphal cell, arising from the upper part of mother cells, position on mother cells varyies from centric to eccentric; foot-cells cylindrical, widening upwarts, with rough cell walls, followed by 2-3 shorter cells, basal septum away from the branching point of the mycelium); conidiophore cells (44)-60-100-(140) µm long, basal cells 11-13-(15) µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial (germ tubes subapical, simple or terminating in club-shaped ends), not branched, sinuate, (32)-35-46-(62) µm long, (12)-16-18-(24) µm wide; aseptate; cell wall hyaline; without distinct fibrosin body fibrosin bodies.

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