Quercus rubra, Belgium, prov. Antwerp, Balen, Griesbroek, Groot Netewoud © Carina Van Steenwinkel

detail, underside

Quercus rubra, Belgium, prov. Namur, Chimay, Forge-Jean-Petit © Stéphane Claerebout

same leaf, underside

more heavily infected leaf

underside

Quercus rubra, Belgium, prov. Limburg, Beverlo, Vallei van de Grote Beek © Carina Van Steenwinkel

ascus (congo red staining)

two asci with numerous conidia

Quercus rubra seedling, Veeenendaal, Kwintelooijen © Ben van As

same leaf, underside, detail

gall

weakly thickened or blistered leaf spots, protruding at the upper side, generally less than a cm in size. Asci hypophyllous without a basal cell, anchored with rhizoid-like extensions to the epidermis, containing numerous conidia (spores that have sprouted). In the next stage of the life cycle they live as yeasts on the leaf surface.

host plants

Fagaceae, monophagous

Quercus cerris, coccifera, frainetto, hartwissiana, lusitanica, petraea, pubescens, robur, rubra.

Plus a long row of North American oaks. According to Redfern & Shirley in the UK mainly on Q. rubra.

synonyms

Taphrina alutacea (von Thümen) Saccardo, 1889.

parasiet

Cladosporium taphrinae is an obligate parasite of this species.

references

Bataille (1936a), Brandenburger (1985a: 62), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Dietrich (2013a), Klenke & Scholler (2015a), Melgarejo Nárdiz, García-Jiménez, Jordá Gutiérrez ao (2010a), Mix (1936a, 1949a, 1956a), Redfern & Shirley (2011a), Tomasi (2014a).