VAN DE VIJVER, Bart, & René LE COHU 2003 (Nov.) Two new species of the genus Geissleria Lange-Bertalot & Metzeltin (Bacillariophyceae) from the Kerguelen and Crozet archipelagos (TAAF, Subantarctica) Nova Hedwigia 77(3/4): 341-349, 25 figs., 1 table