ABSTRACT: 28 species of the genera Asterodon, Dichochaeteand Hymenochaete found in northern America (Greenland, Canada, temperate Mexico and USA), two dubious species and one not yet found here are described, their distribution and hosts (substrata) characterized. Morphological characters in use for identification are described and keys to species found in this region are given. The number of speces inhabiting different zones diminishes from southeastern USA (23 species) to northern Subarctic America (4 species).

KEYWORDS: Asterodon, Dichochaete, Hydnochaete, Hymenochaete

NOMENCLATURAL NOVELTIES: None.