| Noun | 1. | genus Septobasidium - type genus of Septobasidiaceae: smooth shelf fungi usually having a well-developed sometimes thick-walled hypobasidium fungus genus - includes lichen genera family Septobasidiaceae, Septobasidiaceae - a family of fungi belonging to the subdivision Basidiomycota felt fungus, Septobasidium pseudopedicellatum - fungus that frequently encircles twigs and branches of various trees especially citrus trees in southern United States |