Old Movies I Remember

I grew up in the Los Angeles area. One of the things I remember in the early to mid 60's was a television show on Friday nights. It was called "Chiller", and it showed old sci-fi and horror B-Movies. There was no host that I remember, just the opening Chiller sequence (dripping letters) and then the movie of the week. I first saw "House on Haunted Hill", "The Crawling Eye", and other classic horror movies.

There are a couple of movies that I remember from that time that I've never seen since and I can't remember the titles of...

The first one is a sci-fi flick about a spaceflight to either the moon or Mercury. I'm not sure which. The astronauts were beset upon by these "rock men" that seemed to reside in niches on rock/cliff faces. I also seem to remember that the astronauts pointed out that because there was no atmosphere, shadows were completely black. One of them demonstrated it by walking into a rock shadow, thereby completely disappearing.

The other movie was in the horror genre. The monster of this one was a walking tree with a knife embedded in it's chest. It seems that some native criminal was entombed in a hollow tree, and somehow he/it came back to life and animated the tree. At the end of the flick, the hero fired a rifle at the knife, forcing it into the monster's heart and killed it.

Can anyone out there point me to the proper titles of these old movies?