| 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 Protista | | An interactive phylogenetic tree with information about the major groups of protists. |
| Kingdom Protista | | Brief introduction, from courseware for Introductory Biology courses at the University of Southern Mississippi. |
| Photos of Algae | | Images of about 20 genera from the El Eden Ecological Reserve, Mexico. |
| 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. |
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