How to Start a Fire With Fungus

You've seen chaga, a rough-looking, bumpy fungus that grows on tree trunks, before. But we bet you didn't know you were looking at one of the wilderness's best firestarters.

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Spend enough time in the woods and you learn the value of the camp party trick: a useful and unusual way of doing things that’s just flashy enough to impress your fellow backpackers. If it teaches you something about nature, so much the better. This one, pulled from our archives, is sure to wow. —The Editors

Commercial tinder, petroleum jelly-covered cotton balls, and dryer lint are all great for starting a blaze–until you realize you left them at home. But lucky for forgetful hikers, the woods are full of natural firestarters. One of the best: chaga, aka tinder fungus. This chunky black mushroom ignites easily, smolders for hours, and emits a pleasant, woodsy smell. Here’s how to use it.

Find it

Chaga fungus grows year-round in cool northern forests from New England to the Northwoods of Minnesota and Wisconsin and into the southern Appalachians. Look for it on birch trunks; the dark, bulging mushroom resembles burnt charcoal and often sprouts up where the tree has been injured (chaga is a parasite; you won’t become an LNT outlaw by taking a small chunk). Pry a palm-size piece of the fungus off of the trunk with your multitool.

Light it

Flint Scrape any part of your fungus chunk with a knife to produce a pile of powder, then direct sparks directly onto the pile. You can also place the fungus on the ground, off the edge of your flint or fire striker, and let the sparks land right on it. The highly flammable chaga will ignite no matter which method you choose.

Lighter Simply hold the entire chunk to a flame.

Adapted from Born to Explore: How to Be a Backyard Adventurer, by Richard Wiese 

Originally published in September, 2009; last updated August 2023

From 2023