Which tree genus dominates many temperate forests in the Southern Hemisphere?

The tree genus that dominates many temperate forests in the Southern Hemisphere is Nothofagus, commonly known as the southern beech.12

These trees are members of the order Fagales and are found in cooler regions across South America, Australia, New Zealand, New Caledonia, and the mountains of New Guinea. In areas such as the subantarctic rainforests of southern Chile, Nothofagus species are the most typical trees, with northern species being evergreen and southern species being deciduous. Their distribution is often cited as evidence of continental drift following the breakup of the supercontinent Gondwana.13