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40d:Tower-cap
Tower caps are a type of tree which only grow underground (subterranean). Once fully grown (which takes 3 years?[Verify]) they can be designated for wood cutting like other trees, and produce Tower Cap logs.
Tree Farms
It is possible for tower caps to spontaneously grow in muddied subterranean areas only if you have discovered an underground river or underground pond. Unfortunately this is currently extremely difficult to do.
On the subject of spawning Tower Caps, Toady said:
Right now, you can't plant towercaps or bring spawn along, so you need to find a cave river or cave pool, in which case they will start growing underground if it's all working. It's trickier to find such things, so it's mostly impossible to do. Later, you should be able to plant them. There are no arbitrary vegetation caps now.
The "arbitrary vegetation caps" comment is referring to the old limit of 200 trees growing by the cave river in the mud.
Designing a Tree Farm
To create an underground tree farm, you will first need to dig out a large area (in this example we'll go for 24 by 24, inside dimensions). Now, we need to do some math, so first let's take 24 times 24, which is 576. Divide this by 7 (the number of water units in a full tile) and round up (this case it's 83). Now, once again, divide 83 by 7 and add this number rounded up (12). Repeat the previous step for an extra two squares. Now, let's take 83 plus 12 plus 2, which equals 87. Inverse square this number and round normally to get a 9 by 9 square with an extra 7 tiles added on. You'll want to dig a 1x1 hole in one wall of the tree farm, which will attach to the filling room. This filling room must be the same size or perhaps one tile larger than the number you came up with. Dig another 1x1 hole in the far end of this filling room and then dig to your water source. BEFORE breaching the water source, place three doors: one in the first 1x1 hole, one in the second, and a third in your woodcutters' access path. When you do breach the water source, immediately forbid the first door your miner runs through, which should be the door closest to the water source. Don't bother forbidding the other two. Link all three doors to three seperate levers and test the system. Close the door between the filling chamber and main farm area and open the door that leads to the water source. When the filling chamber is full, close the door to the water source, close the door leading to the farm, and open the door between the farm and filling chamber. The water should spread out and coat the entire farm in a thin layer of water. Then simply wait three or so years and you'll have your tower-caps, ready to cut down!
Diagram coming soon.