A bracket fungus with a hard upper surface, growing chiefly on birch and beech.
Fomes fomentarius, family Polyporaceae, class Hymenomycetes
Also called hoof fungus
 Example sentencesExamples
-  Alternately, you could use a piece of tinder fungus and the flint piece.
 -  Several tinders can be used: dry moss tinder, shredded bark of juniper, the interior material of the true tinder fungus or the false tinder fungus.
 -  If you happen to come across a big batch of tinder fungus you can use it as all-weather fuel.
 -  The fungus's other names include tinder fungus, for which it used to be used, and horse's hoof fungus.
 -  Both processes require tinder - some material like degraded wood or tinder fungus - to catch the spark and ignite.