This is possibly the more usual way for mistletoe to grow although it does quite often grow on an espalier tree.
It seems that certain conditions have to be right for it to grow (I don't know what those conditions are) as it is quite parochial in 'choosing' the areas where it will flourish.
posted in response to a comment from @tunia on my previous shot
We have mistletoe on our pear tree if you need any...haha! I was told that mistletoe can kill a tree if not taken off but this tree looks like it is growing just fine.
thank you for showing me