Laundon specialised on rust fungi (
Urediniomycetes), first publishing new species in 1963. Among her most important contributions was a new system of spore terminology published in 1967, which was controversial at the time but was generally accepted by the time of her death. Laundon was an active member of the
International Association for Plant Taxonomy and was on the Special Committee for Fungi and Lichens for a number of years, served on four international committees dealing with fungus
nomenclature, and was invited to investigate the nomenclature of rust genera and write a chapter for
Index Nominum Genericorum. Laundon was the first to realise there were two species involved when the
poplar rusts were first found in New Zealand in 1972, a claim not verified until samples of the spores were examined with an electron microscope. She made significant contributions to the known plant pathogens in New Zealand, publishing many first reports of fungal diseases. Laundon's interests were broader than just
mycology. She designed and built a light meter that could be used for taking photographs through a microscope, and light incubators for a mycology laboratory, as well as learning to programme computers. She also had the species
Phoma laundoniae named in her honour. == Trans Activism ==