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These protists (slime molds and water molds) are similar to fungi by concurrence---they have filamentous body structure, which is a morphological adaptation that increases exposure to the environment and allows for effective decomposition (its ecological role.) However, these protists are more similar to amoeboid protists than fungi in their cellular organization, reproduction and life cycles. The life cycle of funguslike protists is complex, giving it an adaptation to allow for survival in changing environments and transport to new food sources. Some examples of fungus-like protists are:
Dinoflagelates: Components of pastures of phytoplankton, this is a type of miscroscopic algae floating near the surface of the sea. Dinoflagelate blooms are brownish-red because of xanthophylls and often release toxins. Some are symbionts or parasites.
Bacillariophyta (diatoms): This type of algae is related to gold and brown algae; reproduces asexually and is contained in plankton.
Chrysophyta (golden algae): This algae contains yellow and brown cartenoids and xanthophylls, is biflagellated, colonial, and survives by forming resistant cysts from which active cells emerge when conditions are favorable.
Phaeophyta (brown algae): This algae is multicellular, colored by accessory pigments, possesses chloroplast structure homologous to golden algae and diatoms, and has anatomical and biological adaptations to rough tides. Also reproduces by alteration of generations from multicellular haploid to diploid form.
Rhodophyta (red algae): This algae is red because of accessory pigment phycoerythrin, and inhabits warm coastal water while some can absorb blue and green wavelengths in deep water.
Chlorophyta (green algae): This algae contains green chlorophyll, and can lie as plankton or occupy protozoa and invertebrates as photosynthetic symbionts that contribute to the food supply of the hosts.