Taphrina betulae (Fuckel) Johanson, 1886

on Betula

Taphrina betulae: leaf spots on Betula pendula

Betula pendula, Belgium, prov. Antwerp, Dessel, den Hof, 11.vi.2018 © Carina Van Steenwinkel

Taphrina betulae: leaf spots on Betula pendula

leaf spots

Taphrina betula: leaf spots on Betula pendula

leaf spots upper side

Taphrina betula: leaf spots on Betula pendula

underside

Taphrina betulae: asci

asci

Taphrina betula: asci

asci with few, relatively large spores

Taphrina betulae: asci

two asci on tneir basal cell

Taphrina betulae: ascospores

ascospores

gall

The gall resembles the one by T. carnea, but is much less strongly expressed: isolated leaves have spots (± 1 cm), and only young leaves have bulges. At maturity the surface is lined with a layer of 20-50 µm high asci, each one on a basal cell.

host plants

Betulaceae, monophagous

Betula pendula, pubescens, turkstanica.

synonyms

Exoascus betulae Fuckel, 1874.

references

Abras, Fassotte, Chandelier & Cavelier (2008a), Bacigálová, Mułenko & Wołczańska (2005a), Bataille (1936a), Brandenburger (1985a: 53), Buhr (1964b), Dauphin & Aniotsbehere (1997a). Doppelbaur & Doppelbaur (1973a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Mix (1949a, 1956a).

mod 3.iii.2019