<i>CHROOMONAS</i>AND OTHER BLUE‐GREEN CRYPTOMONADS¹

Abstract

ABSTRACT Examination of four selected Chroomonas species indicates significant structural diversity within the genus. The concept of Chroomonas is reviewed, and new observations are presented on C. collegionis sp. nov. and C. coerulea (Geitler) Skuja. Examination of two other species, Chroomonas caudata Geitler and Chroomonas daucoides Conrad et Kufferath, forms the basis for the description of two new genera, Komma and Falcomonas. The generic taxonomy is based on the nature of the furrow‐gullet system, periplast structure, and features of the plastidial complex. Certain nomenclatural treatments were required: Cyanomonas americana (Davis) Oltmanns is transferred to Chroomonas, C. rosenbergiae Huber‐Pestalozzi is relegated to synonymy with C. coerulea (Geitler) Skuja, and the descriptions of Butcher's species C. mesostigmatica sp. nov. and C. collegionis sp. nov. are completed.