in one of those old portmanteau horrors from 60s there was one story about a strange plant that takes over and (iirc) kills people
remember one scene had a scientist putting a section of the plant under a microscope and saying "look...brains!"
cant remember what film, ring any bells?
edit found it, it's from Dr Terror's House Of Horrors (1965) and that segment is called 'The Creeping Vine'
Yeah, that was the one I was thinking about.
I think this film is the first portmanteau I ever saw (I wish they make more of them) and it is still one of my favorites. Maybe because it stars those grand old men of British horror cinema: Christopher Lee, Peter Cushing, and Michael Gough. And it is only Donald Sutherland's 2nd credited film appearance in a theatrical film.
What I did not know at that time, but later found out, if the victim of "the vine" looks familiar, it might be cause he was played by Bernard Lee, who was Sean Connery's boss in the James Bond series.