| AlgaeBase: Information on the algae of the world, including terrestrial, marine, and freshwater forms. Search by genus, species, or common name. Includes images and references. |
| Caribbean Reef Plants: Sample pages and images from an identification guide to marine algae and seagrasses. |
| Droplet: Microscopy of the protozoa by Piotr Rotkiewicz - includes images, systematics, glossary, forum, and resources. |
| Freakin Fucus: Introduction and technical information regarding seaweeds and phycology. |
| Introduction to the Chromista: From Microbes to Giants: General discussion of the kingdom-level taxon Chromista, including diatoms, kelp, downy mildew, and other organisms that possess chlorophyll and are mostly photosynthetic, but are not plants. Includes links for more information. |
| Kingdom Protoctista: Introductory look at the Kingdom. |
| Natural Perspective: The Protoctist Kingdom (Protoctista): Describes the kingdom as "a catch-all for the multicellular organisms which don't fit into the Animal, Plant, or Fungus Kingdoms" and describes its scope. |
| Parasitic Protozoa: Overview of the one-fifth of protozoan species that are parasitic. |
| Photos of Algae: Images of about 20 genera from the El Eden Ecological Reserve, Mexico. |
| Protist Image Data: Pictures and information on selected genera of algae and protozoa. |
| Protist Information Server: Image database archiving more than 34,000 images (511 genera, 1944 species) and 556 movie clips for research and education. |
| Protistan Phyla: Short articles and illustrations of the major groups of protists. |
| Seaweed Site: Algae-L discussion list, book list, comprehensive information, and photographs. |
| The Center for Phycological Documentation: Information about algae and their taxonomy, including 'The Catalogue of the Benthic Marine Algae of the Indian Ocean,' and 'The Index Nominum Algarum,' a compendium of circa 200,000 algal names. |
Classical
