Codium fragile
- Research project by Kathy Tyson providing illustrated information on the habitat, stucture and reproduction of this species, commonly known as Dead Man’s Fingers.
- http://www.mbari.org/staff/conn/botany/greens/kathy/index.htm

Codium setchellii
- Research project by Raul Nava providing comprehensive information on this encrusting green alga, with photographs and diagrams.
- http://www.mbari.org/staff/conn/botany/greens/Codium_setchellii/index.htm

Codium tomentosum
- Photograph and information on this species, commonly known as Velvet Horn, including its habitat, description and key identification features.
- http://www.marlin.ac.uk/species/Codiumtomentosum.htm

Codium fragile subsp. tomentosoides
- Photograph and information on this species, commonly known as Green Sea Fingers, including its habitat, description and key identification features.
- http://www.marlin.ac.uk/species/Codiumfragilesubsp.tomentosoides.htm