Algologists are identifying evolutionary characters which are stratigically placing the green algae as progenitors of the land plants. Chlorococcales Cells may be solitary or in non-filamentous colonies. Very elaborate amd exotic thalli, some are encrusted with lime. Ulotrichales Restriction of cell division to one direction. Unbranched filamentous organisms.
Some cells are multinucleate.
Oedogoniales A well defined Order with several unique features. They are regarded as a small group that has diverged from the main line of evolution. The body of the plant consists of simple or branched filaments with a modified attachment cell. The cells are uninucleate. Charales This Order is very different from the rest of the Chlorophyta.