You need to be more precise. What logos and trade marks in fine art and landscape photography? Are they prominent or incidental? Selling a photo to whom, for what purpose?
The purpose would be a wall hanging in a home (or business, I suppose). I don't know the difference between prominent or incidental, but I suppose we could use this photo as an example:
The Sky is Awake ... by Trevarthan, on Flickr
I took this. That's my daughter. The Tennessee Aquarium is in the background, and I know that this photo is fine for stock, because I have a model release signed by myself for my daughter, and the front of the aquarium is blurred.
However, what if I reshot this photo, removing my daughter and bringing everything into sharp focus with a nice sunset sky? I'm pretty sure there is some sort of advertisement on the aquarium in the background. Is that a problem?
Similarly, I know from trying to submit this photo for stock, that fountains are often considered art, despite being public landmarks:
Chattanooga Riverfront Fountains by Trevarthan, on Flickr
Could I get in trouble trying to sell this photo as fine art (assuming I retook it in a way that didn't suck, technically - it's pretty soft and weak as is)?