Necrosis with putrefaction is called as
ref Robbins 9/e p129 Gangrene is a form of necrosis of tissue with superadded putrefaction.This is a type of coagulative necrosis that occurs due to ischaemia(e.g. in bowel, limb etc.).
Dessication
Gangrene
Liquefaction
Coagulation necrosis
General anatomy