The face-down card has no name or colors. Its only type is land, its only subtype is Forest, and its only ability is “Tap: Add
If the face-down card has morph, you can pay its morph cost to turn it face up.
If one of these Forests is turned face up, the effect making it a Forest land will expire. The face-up permanent will again have its printed name, type line, mana cost, abilities, and so on.