In Elisa's youth her father was employed at the Royal Castle of Laeken, giving her the opportunity to explore the large grounds and park. A palace governess tutored her but when ten years old she was sent to a boarding school at nearby Vilvoorde, where she rued her loss of freedom, but finally adjusted to the new discipline and developed her talent for music. Her music was set aside in favour of a commercial career when she was twenty years old and her health soon suffered as a result of long hours spent at unfulfilling work. Knowing of her interest in botany, her family physician introduced her to Jean-Edouard Bommer, a botanist and fern specialist whom she married in 1865. One of their children, Charles, would later become a palaeobotanist.
Botanical career
Despite a growing and demanding family, Elisa was drawn further into the world of botany and total described more than 200 fungal species. In 1873 she met Mariette Rousseau who had similar interests and much of their work was produced together. Jean-Edouard Bommer suggested the two friends study the local fungi, virtually untouched except forthe work of Marie-Anne Libert, Gérard Daniel Westendorp and Jean Kickx. Making use of Kickx's Flore cryptogamique des environs de Louvaine and Flore cryptogamique des Flandres, and the Systema mycologicum of Elias Magnus Fries, they launched into an arduous and inspiring project. In this they were greatly helped by access to the library of the local Jardin Botanique. A succession of monographs followed and were published in the Bulletin de la Societe Royale de Botanique de Belgique in 1879, 1884, 1886 and 1890. Their joint paper on Costa Rican fungi appeared in 1896, and dealt with material collected from 1887 by Henri François Pittier. They also worked on the fungi collected by the 1897-99 Belgian expedition led by Adrien de Gerlache de Gomery to Antarctica, producing a report in 1905. Bommer expanded the scope of her studies by including the Netherlands and particularly The Hague and environs. In her final years physical disability severely limited her activities, but never stopped her piano-playing, and embarked on botanical painting, including fungi and flowering plants. On her death her mycological collection went to the Brussels Jardin Botanique and is currently housed at the herbarium in Meise. She was commemorated in the genus Bommerella created by Élie Marchal.
