intersterility trials, and genetis. Mating tests have identified four inter-sterility groups: N, T, Y, and Z. The seven species are H. orientale (N-type), H. ecrustosum (T-type), H. insulare sensu typi, H. linzhiense, H. australe, H. amyloideum, H. tibeticum (Z-type). Heterobasidion araucariae Heterobasidion araucariae is a saprotrophic decay fungi found in Australia, Oceania, and may be present in Indochina. While not considered pathogenic it can help decay logs and stumps of Agathis, Araucaria, and Pine species. Other Species There are three isolates that have been proposed as new species but further description may be necessary. Heterobasidion pahangense Corner Heterobasidion rutilantiforme (Murrill) Stalpers Heterobasidion arbitrarium Corner References Russulales Russulales genera Taxa named by Julius Oscar Brefeld Taxa described in 1888