Polysiphonia
- Photographic study by Jan Parmentier of this red alga which well illustrates its complex life cycle.
- http://www.microscopy-uk.org.uk/mag/artmar99/red.html

Polysiphonia opaca
- Photomicrograph of this red alga with one of its reproductive structures.
- http://www.microscopy-uk.org.uk/mag/articles/mayimg.html

Polysiphonia lanosa
- Photograph and basic information on this species which lives as an epiphyte on the seaweed Ascophyllum nodosum.
- http://www.marlin.ac.uk/species/Polysiphonialanosa.htm

Polysiphonia sp.
- microscopic image
- http://www.dipbot.unict.it/sistematica/Polysi_s.html