Tundra(2.0 and earlier)
Wood is a common block in PickCrafter, which can be found in the Plain biome. Prior to Version 3.0, it could also be found in the Tundra biome with a birch sprite, before Birchwood was added as its own unique block. There are two block wall sprites, oak and spruce, but they both drop Wood. Wood can also be obtained from the Block Select menu.