organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Kingdom Protoctista Hogg, 1860 Phylum Xanthophyta Allorge, in Fritsch (1935) see Class Xanthophyceae P. Allorge ex Fritsch (1935) Class Heterosiphonales see Order Vaucheriales Bohlin (1901) Genus Botrydium Wallr. (1815)