Flood stalk

The Flood Stalk is a Flood structure. If it is destroyed, it releases a couple of groups of infection forms. It seems to consist of a few of Flood Growth Pods on a biomass stalk. Flood Stalks, like Flood Eggs, are benign and only act when harmed. Unlike in the case of Flood Eggs, they will not release resources so can be ignored with no loss.

Trivia

 * The Rebel Leader skull on the Halo Wars level requires the player to kill 20 Flood Stalks.