Identification and occurrence of Australian Armillaria species, including A. pallidula sp.nov. and comparative studies between them and non-Australian tropical and Indian Armillaria.
Interfertility studies with single-basidiospore isolates showed that the Australian species A. luteobubalina, A. novae-zelandiae, A. fumosa, A. hinnulea and A. pallidula sp.nov. are biological species. Single-basidiospore isolates of A. novae-zelandiae from Australia and New Zealand were interfertile, confirming the occurrence of this species in both countries. The occurrence of A. novae-zelandiae, A. fumosa and A. hinnulea in New South Wales and Queensland and A. luteobubalina in South Australia, New South Wales and Queensland is documented. The host range of the latter species has been extended. A. pallidula is described from a plantation of Pinus caribaea on a former subtropical eucalypt forest site in Queensland. The affinities between it, other Australian species, the tropical species A. fuscipes, A. fellea, A. mellea var. camerunensis and a number of Indian species of Armillaria are considered. Detailed descriptions of the micromorphological features of A. fuscipes and A. fellea are given.