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Fallout Wiki

Mutant cave fungus is a consumable item in the Fallout: New Vegas add-on Old World Blues.


While cave fungus is normally grown in caverns as a reliable healing reagent, some caverns over the years have become irradiated. This resulted in the mutated cave fungus, which can be used to make black blood sausages and other consumables.

Whereas a normal cave fungus would reduce radiation, mutant cave fungus adds radiation when consumed and has an appropriate green glow. This item is needed to create nightstalker squeezin's, thick red paste, black blood sausage and Battle Brew. They respawn in the named locations every 72 game hours (3 game days).

Survival skill effect

SkillEffectHardcore effect
10+2 Hit Points for 5s-24 Starvation 
20+2 Hit Points for 5s-28 Starvation 
30+3 Hit Points for 5s-32 Starvation 
40+3 Hit Points for 5s-36 Starvation 
50+4 Hit Points for 5s-40 Starvation 
60+4 Hit Points for 5s-44 Starvation 
70+4 Hit Points for 5s-48 Starvation 
80+5 Hit Points for 5s-52 Starvation 
90+5 Hit Points for 5s-56 Starvation 
100+6 Hit Points for 5s-60 Starvation 
Note: Radiation is not affected by Survival skill level.


This is a list of fixed non-random places to find mutant cave fungus (37 total).