Old trees are often killed by the decay fungus Piptoporus betulinus, and the branches often have witch's brooms caused by the fungus Taphrina betulina.
Betula pubescens | Acacia pendula | Betula ermanii | ''Illustration of Peristeria pendula | Betula utilis | Betula populifolia | Betula pendula | Betula nigra |
Many of the trees symbolise grief such as Weeping Beech, Silver Birch (Betula pendula var. Tristis, which in Dutch is known as the Weeping Birch), Dutch Elm (in Dutch known as Weeping Elm) and Weeping Willow.