 In 1982, he co-authored an extensive description of the stinkhorn species "Clathrus archeri", documenting its first known appearance in North America, an extensive fruiting of this species in his home town of Santa Cruz.In 2008, he was primary author of two papers that provided a taxonomic revision of the California golden chanterelle and of several species in the "Boletus edulis" complex found in California.The California golden chanterelle was described as a distinct species, "Cantharellus californicus", while several California porcini species were described as distinct species or subspecies, "Boletus edulis" var.