Giant green fungus
From MUME
Giant green fungi are aggressive, evil level ~11-12 plants, found in various locations around Arda.
A giant, strange looking green fungus is here, ready to devour you in seconds. >examine fungus This giant green fungus is a rare but deadly species of giant fungus. Able to animate itself it considers you its next meal upon which to lay new fungal filaments and derive nourishment.
