Telia on leaves are accompanied by sunken, yellow spots on upper surfaces. The discovery of the Australian rust further illustrates the biogeographic connection between the native rust floras of Australia and Hawaii discussed under Acacia rusts. Undersurface of maile rust-infected leaves. Distinct, sunken yellow spots on the upper leaf surfaces corresponding to telia on hypertrophied tissue on the lower surface are typical of maile rust. . Closeup of maile rust telia occurring as clusters on hypertrophied tissue on the leaf undersurface.
Maile rust occurs only in the telial state.
Maile rust on a leaf midrib. Maile rust occurring as a stem gall. Following karyogamy in the teliospore, the diploid nucleus migrates into the basidium where meiosis occurs. A single diploid nucleus in a mature teliospore following karyogamy. Upon germination of the teliospore, a single terminal basidiospore is produced.