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Photo: Carl Wilhelm von Nägeli (1817–1891), Public domain (via Wikimedia Commons)

Scenedesmus

Scenedesmus obliquus

Also known as Acutodesmus obliquus (a taxonomic synonym used in some modern classifications)

At a glance
Family
Scenedesmaceae
Type
Freshwater green microalga (unicellular to colonial)
Parts used
Whole-cell biomass, harvested and dried
Size
Microscopic; individual cells run roughly 5 to 30 micrometers long, typically joined into flat, spindle-shaped colonies of 2 to 8 cells
Bloom
Does not flower; reproduces asexually by autospores, tiny replica cells released from within the parent cell
Habitat
Ponds, lakes, slow streams, and nutrient-rich freshwater worldwide, including puddles and eutrophic waters
Acquisition
Grow or buy
This plant in HerbSense

Key benefits

Exceptionally high protein content
Rich in carotenoid pigments
Contains beneficial polyunsaturated fats
Studied for sustainable biofuel

Traditional uses

Scenedesmus obliquus does not carry centuries of kitchen-garden or apothecary lore the way lavender or chamomile do. Its story belongs to the laboratory rather than to folk tradition, beginning in the 1950s when European researchers started mass-culturing this fast-growing green alga in open outdoor ponds, drawn to its rapid growth and unusually high protein content at a time when feeding a hungry, rebuilding world felt urgent. That early work helped launch the modern field of microalgae cultivation, and Scenedesmus has remained a workhorse research species ever since, studied for its protein, its pigments, and more recently its promise as a feedstock for biofuel. Today it lives mostly in laboratories, aquaculture feed systems, and a small corner of the algae-supplement market, rather than in a traditional herbalist's cabinet.

How to grow & use it

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The full apothecary for Scenedesmus

Traditional remedies and step-by-step preparations, a complete growing guide, and how to harvest, dry, and store it, all unlocked with HerbLens Unlimited.

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  • Growing guide
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Pairs well with
  • Spirulina
  • Chlorella
  • Astaxanthin-rich microalgae
Substitutes
  • Chlorella
  • Spirulina
Choose it when

For the curious naturalist, not the tea cupboard, a reminder that even a single drop of pond water can hold a tiny, sun-fed factory.

Did you know?

Long before "algae protein" became a wellness-aisle buzzword, mid-twentieth-century scientists were already growing Scenedesmus obliquus by the vat-load in outdoor ponds, chasing the idea that a fast-dividing, sun-powered microalga might one day help solve world hunger.

Safety

Scenedesmus itself is not known to be toxic, but it should never be gathered from the wild since it often grows alongside cyanobacteria that produce serious toxins and the two look alike. Only use commercially cultivated, purity-tested products.