Most algal genera are haplontic,but some of them such as $A$,$B$,and $C$ are haplo-diplontic. Here $A$,$B$,and $C$ refer to:

• A
  $A-Ectocarpus, B-Polysiphonia, C-Kelps$
• B
  $A-Volvox, B-Spirogyra, C-Kelps$
• C
  $A-Spirogyra, B-Polysiphonia, C-Ectocarpus$
• D
  $A-Volvox, B-Kelps, C-Ectocarpus$