ARSENE AND LES-FRERES-DES-ECOLES-CHRETIENNES COLLECTIONS AT THE US NATIONAL HERBARIUM PERTINENT TO BOULY-DELESDAINS-LICHENS-DU-MEXIQUE

At least 104 isotypes and isosyntypes of Mexican lichens described by Bouly de Lesdain in Lichens du Mexique are accessioned in the US Natio nal Herbarium. These specimens, most obtained in 1918 as a gift from A rsene G. J. Brouard (Frere G. Arsene), are duplicates of type material s destroyed in 1940 with Bouly de Lesdain's private herbarium. Since f ew of these original materials are extant in other collections, the US National Herbarium's set of isotypes and isosyntypes provides potenti al lectotypes and neotypes for many names published in Lichens du Mexi que.