Abstract
Detailed descriptions, supplemented by line drawings, of holotype collections of 13 species of wood-rotting fungi described from North America by Burt are presented. Additional specimens are cited, providing many new geographic records and substratum relationships for North America. Hyphal systems are discussed and Hypochnus canadensis Burt (now Tomentella bombycina (Karst.) Erikss.) is reported as having a dimitic hyphal system. One new combination is proposed, Tomentella epigaea (Burt) Larsen (basionym, Hypochnus epigaea Burt).