Navy vs The Night Monsters, The (1966)

aka’s: Monsters Of The Night/The Night Crawlers

In Operation Deep Freeze, a scientific expedition to Antarctica discovers unusual tree specimens. When specimens are shipped out for further study, the trees are accidentally introduced to a south seas Navy base, soon revealing themselves to be killing, acid-secreting monsters that live by night. Stars Mamie Van Doren, Anthony Eisley and Billy Gray. Also with Bobby Van.