[Legate of Amon Lanc]

Originally Posted by skip spence

I don't think Old Man Willow, or the other malevolent trees in the Old Forest can be classified as huorns. As far as I can remember, Huorns were like Ents, of a humanoid shape, but slowly reverting to a more vegetative state of being, becoming more like trees. But they could still be roused and move much like the Ents, even to swiftly march great distances over open land, as the Helm's deep episode demonstrates. Old Man Willow in contrast is very much a tree, albeit an ancient and cunning one with a great singing voice. I don't think he can move much, or unroot himself. And since he's the most notorious tree in the Forest, I assume the others are more or less like him, only less powerful.

Depends on how far huorns reach, and what do you classify as "huorn" yet and what not. There are ents who start to seem more treeish, but there are also trees who start to "awaken" and become more "entish", or simply, more "alive". In fact, Old Man Willow fits pretty well to this description given by Treebeard:

Originally Posted by Two Towers; Chapter 4: Treebeard

Some of us are still true Ents, and lively enough in our fashion, but many are growing sleepy, going tree-ish, as you might say. Most of the trees are just trees, of course; but many are half awake. Some are quite wide awake, and a few are, well, ah, well getting Entish. That is going on all the time.
When that happens to a tree, you find that some have bad hearts.

The funny thing is that in the next moment he speaks about willows by Entwash who were good. Just a remark on Treebeard's side, however from the position of the author, it may be a signal to the reader: "willows! Remember?" So that you may connect these two speeches. It's just my interpretation, though. However, the dialogue continues...

Originally Posted by Two Towers; Chapter 4: Treebeard

"There used to be some very dangerous parts in this country. There are still some very black patches."
"Like the Old Forest away to the north, do you mean?" asked Merry.
"Aye, aye. something like, but much worse. I do not doubt there is some shadow of the Great Darkness lying there still away north; and bad memories are handed down. But there are hollow dales in this land where the Darkness has never been lifted, and the trees are older than I am."

I suggest reading the whole passage about this; while it is not clear if we can just label Old Man Willow as one of those, it is interesting thing about the nature of the trees.