A fungus isolated from a yellow, stringy decay of white spruce and other conifers in Western Canada was at first identified asFlammula conissanssensu Ricken. This fungus was compared with an authentic isolate ofFlammula conissans(Fr.) Gillet obtained from Europe. They were shown to be separate species through comparison of cultures, fruit bodies, spores, and the factors affecting fruiting in culture, as well as by pairings of monosporous mycelia. The Canadian fungus was identified asFlammula alnicola(Fr.) Kummer. Basidio-spores ofF. alnicolagerminated after cold treatment at −7 °C. The requirement of moderate cold-treatment for spore germination may account for the occurrence of the fungus only as a root-rot pathogen.