European storytelling planted its fears in the forest. The wood in the fairy tales, Grimm's above all, is where children are abandoned, witches keep houses, wolves speak and paths vanish; it is the place outside the village where the rules fail and transformation becomes possible, and folklorists have long read it as the tales' standing image of the unknown through which every protagonist must pass. Dante fixed the image for high literature in the opening lines of the Inferno: midway through life's road, a dark wood, the straight way lost. The dream forest inherits both registers, peril and passage.
The Jungian tradition made the inheritance explicit, reading the forest as the unconscious itself, dense, pathless, alive and not hostile so much as indifferent, the place where the dreamer's ordinary orientation gives out. Being lost among the trees, on this reading, is not failure but the necessary condition of finding anything new; the path, when it appears, matters precisely because the wood does not provide one. Writers on the fairy tales in the psychoanalytic line, Bruno Bettelheim among them, read the children's abandonment in the wood the same way, as development's demand dressed as catastrophe.
The folk dictionaries read forests more plainly, toward confusion, hidden enemies or coming ease as the dreamer finds or loses the way. All of it is tradition, not fact, and the dream's own feeling, dread, enchantment or strange calm, is the detail interpreters weight most.