Polyporus zonalis var. rigidus (Lév.) Cleland & Cheel , legitimate, scientific
Cleland, J.B. & Cheel, E. (1917), Notes on Australian fungi, no. IV. Polyporus, Fomes and Hexagona. Journal and proceedings of the Royal Society of New South Wales 51: 531 [comb. nov.]
basionym: Polyporus rigidus Lév. legitimate
AusFungi (2019), AusFungi 21 Jan. 2019: - [taxonomic synonym]
taxonomic synonym of: Nigroporus durus (Jungh.) Murrill legitimate