Hey Moth,
I've come across the name Linne Loiny before, but no idea which site it relates to. I added the Fortingall long cairn and standing stone sites, but couldn't find alternative names for them. I think Nicks right- it could be a cairn adjacent to the stone. There's a lot of archaeology in that small area commonly known as the roman camp (BTW any thoughts on that one? Years ago a frined of mine commented on the fact that from Drummond Hill the camp did not appear to have the layout of a Roman site. Just a thought.)
Cheers,
Martin