Report of the Nomenclature Committee for Algae: 22

The name Amphidoma (Dinophyceae) is not recommended for conservation as being of feminine gender and with a conserved type because the feminine gender is already established, and because there is no known evidence to show that the existing type (A. acuminata) is not congenric with A. nucula, the type proposed for conservation. The name Heterocapsa (Dinophyceae) is recommended for conservation with a conserved type. Two requests for binding decisions were considered, Cosmarium geminatum and C. gemmatum (Streptophyta), and Trigonium (Bacillariophyta) and Trigonum (Streptophyta). The NCA did not consider the names concerned sufficiently similar to be confused and recommended that they not be treated as homonyms.