The agaricomycete Quatsinoporites cranhamii was described from a Cretaceous fossil and Appianoporites vancouverensis, from the same deposits as Margaretbarromyces were jointly described in a 2004 research paper.
Appianoporites, the first fossil fungus species to be described from the Appian Way strata, is one of only three found on Vancouver Island, British Columbia: the agaricomycete Quatsinoporites cranhamii was described from a Cretaceous fossil at the same time as Appianoporites, while a third fungus, Margaretbarromyces dictyosporus was described three years later.