Herbier Cryptogamique ou Collection des Plantes Cryptogames et Agames qui Croissent en Belgique, G.D. Westendorp [251-350]
Pfister lists Westendorp as being the sole preparer of Fascicles 1 - 7 (nos. 1 - 350), published in Courtrai. In opposit to Sayre all title pages of fascicles I to X at LD give uniformely Westendorp & Wallays as editors. where as the change in editing location is correct.