Cave Fungus (Fallout: New Vegas)

 is a consumable item in Fallout: New Vegas.

Characteristics
Seems legion troops have a chance to drop these.

One can be found on the fourth level of Vault 22 in the kitchen/bar.

There is one located on the floor in the room with the bar on the upper level of the Vault 22 common areas.

There are a couple of these items located in the first trailer in the Red Rock Drug Lab.