Taphrina caerulescens (Desmazières & Montagne) Tulasne, 1866

on Quercus

Taphrina caerulescens galls on Quercus rubra

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

Taphrina caerulescens gall on Quercus rubra

detail, underside

Taphrina caerulescens on Quercus rubra

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

Taphrina caerulescens on Quercus rubra

same leaf, underside

Taphrina caerulescens on Quercus rubra

more heavily infected leaf

Taphrina caerulescens on Quercus rubra

underside

Taphrina caerulescens on Quercus rubra

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

Taphrina caerulescens: ascus

ascus (congo red staining)

Taphrina caerulescens: ascus

two asci with numerous conidia

Taphrina caerulescens on Quercus rubra seedling

Quercus rubra seedling, Veeenendaal, Kwintelooijen © Ben van As

Taphrina caerulescens on Quercus rubra seedling

same leaf, underside, detail

gall

weakly thickened or blistered leaf spots, protruding at the upperside, 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.

hostplants

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.

parasiet

Cladosporium taphrinae is an obligate parasite of this species.

references

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

02/04/2017

pub 16.v.2017 · mod 17.vii.2017