Algae
Algae can be observed using unstained wet mounts. This gives an overview of algae.
The long strands are the tubular filaments (hyphae) that have developed from the fungal spores. Yeast cells (rounded, yellow) are budding from the ends of the hyphae (red). Candida albicans causes the infection known as candidiasis which affects the moist mucous membranes of the body, such as skin folds, mouth, respiratory tract and vagina. Oral and vaginal conditions are known as thrush.
Protozoa can be observed using unstained wet mounts. The following website gives an overview of some of the commonly found freshwater protozoa.