And now... Number 6: Crimson Fungus
Crimson Fungus is easily recognizable due to the fact that, though it has the size, shape, and trunk of a tree, it is actually (as its name suggests) a giant fungus. As such, upon quite a long way away inspection, you will see that it does not, in fact, possess leaves and rather has a tree leaf shaped cap. Also, it will seem to be formed of cubes. The reason for this is unknown.
It should be noted that the enviornments in which the Crimson Fungus thrives is incredibly hostile to humans. If you spot a Crimson Fungus while unprepared for such an enviornment, you should turn back immediately. After recognizing it, of course.