What is a tinder fungus (Fomes fomentarius)? This question I have asked many times on various occasions. Do you know the tinder fungus? Do you know what it is? In many cases, even among nature-loving people, the reaction was often just a shake of the head. The fact is that there is very little knowledge about the tinder fungus. It's a pity, but almost to be expected, as tree fungi are hardly mentioned in guided forest tours that I have participated in. Since I have been intensively involved with the topic of tinder fungus and tree fungi in general for years, and discussions about it take place among like-minded individuals, I have been encouraged from various sides to write down my experiences and practically acquired knowledge about the different methods of processing tinder, thus preserving it for future generations.