Northern Tooth Fungus, Climacodon septentrionale, is an unusual combination of both a shelf (also called bracket) fungus as well as a toothed fungus. Typically a shelf fungus produces spores inside pores located on its underside. Northern Tooth Fungus, however, produces spores on pendant, spine- or tooth-like projections on its underside (see insert). This fungus usually has several tiers of “shelves” that grow in tight, thick layers, and change from white to light tan as they age.
Northern Tooth Fungus is a parasite of living trees, especially Sugar Maples, and it causes the central heartwood of the living tree to rot. The only sign that a maple has this fungal parasite is the appearance of these shelf-like fruiting bodies in late summer or fall. Often trees with this fungus become weak and are blown over by the wind. As with most shelf fungi, it is considered to be inedible. (Thanks to Jeannie Killam for photo op.)
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