Torchstalk

Torchstalk was a fungus that grew in the Underdark.

Description
The torchstalk mushroom grew to a height of one to two feet (30 to 60 centimeters) and had a flammable cap. Unfortunately, about one in six of these fungi exploded when lit, sending out flaming spores in a ten foot (three meter) radius, pelting all within range. Those that didn't burst ignited like a torch and could be used as such for 24 hours.