From the book:

Have you heard of the great Forest of Burzee? Nurse used to sing of it when I was a child. She sang of the big tree-trunks, standing close together, with their roots intertwining below the earth and their branches intertwining above it; of their rough coating of bark and queer, gnarled limbs; of the bushy foliage that roofed the entire forest, save where the sunbeams found a path through which to touch the ground in little spots and to cast weird and curious shadows over the mosses, the lichens and the drifts of dried leaves.