Email message from Lisa Decesare (A, GH) on the A. Bennett (J. Bot. 33: 138 (under Potamageton coloratum). 1895) reference linking Du Croz with Ducros. Full name & Dates from Lotte Burkhardt
Example of Name Published
Potamogeton plantagineus Ducros ex Roem. & Schult., Syst. Veg., ed. 15 bis [Roemer & Schultes] 3: 504. 1818.