Cornelis Andries Backer (1874–1963) was a Dutch botanist and pteridologist. He was born on 18 September 1874 in Oudenbosch and died on 22 February 1963 at Heemstede, The Netherlands. He stayed thirty years in the Dutch East Indies and did research on plant taxonomy on the islands of Java and Madura.
Gualterio Looser Schallemberg (September 4, 1898, Santiago – July 22, 1982) was a Chilean botanist and engineer of Swiss parentage. He owned a factory that made agricultural implements.
In 1928 Looser joined the American Fern Society, and started to publish papers on the pteridophytes of Chile. His herbarium containing ca. 8000 specimens was given to Conservatoire et Jardin botaniques de la Ville de Genève.