She specializes particularly in Podostemaceae found on the African continent, discovering and cataloging several species.
Her contributions to African botany led scientists to name a species of Podostemaceae in her honor in 2016.
[2] Later, within this institution, Cusset was the first to digitize botanical data from the regions covered by her research, between 1985 and 1988.
[3] She is partly known for having described two new genera of Podostemaceae, "Djinga" and "Zehnderia", and 18 new species, in addition to renaming 35 others.
[6] In 2016, a species of Podostemaceae from Ivory Coast was named in her honor by Ghanaian and British botanists Gabriel Ameka and Martin Cheek, "Macropodiella cussetiana".