|Description:||This 1971 image depicted a Sabourauds dextrose agar slant culture, which had cultivated a colony of Prototheca stagnora algal organisms. This alga lacks the presence of plastids, and is therefore, achlorophyllous.|
Under microscopic analysis, i.e., PHIL 10627, Prototheca spp. resemble a fungal organism, and can therefore, be mistaken when attempting to identify these algae.
Similar to the members of the genus Chlorella, but without chlorophyll, Prototheca spp. are heterotrophic, , which means these organisms require carbon in order to thrive, and obtains this nutrient through its consumption of organic substrates.