Betula grossa is a type of tree. Just like we have different types of fruits, there are different types of trees. This tree is known for having very big and thick bark, which is like the skin of the tree. It also has lots of branches and leaves that grow in a very particular way, making it easy to recognize. It's also known as the Japanese cherry birch, because it's found mainly in Japan. It's a really cool tree that scientists like to study and people like to look at because of its unique features.