Taphrina betulae (Fuckel) Johanson, 1886

on Betula

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

leaf spots

leaf spots upper side

underside

asci

asci with few, relatively large spores

two asci on tneir basal cell

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).