19/08/2026
Is it seaweed, is it dried cow dung or is it algae?
And if it’s featured on this page, then is it edible!?
These are some of the questions that might be running through your head. So here, let me introduce you to Nostoc commune. It’s neither of those above, but an edible cyanobacterium that dries up during summer and comes back to life when water becomes available.
Swipe 👉🏽 to read more about Nostoc.
Know more about Nostoc? Have you encountered or eaten it where you live? Tell us in the comments 👇🏽👇🏽
Nostoc commune is a colonial species of cyanobacterium. When wet, it can be bluish-green, olive green or brown, but in dry conditions it becomes an inconspicuous, crisp, brownish mat. It is found in many countries around the world and is able to survive in extreme conditions, from polar regions to arid areas. It is a terrestrial or freshwater species and forms loose clumps on soil, gravel and paved surfaces, among mosses and between cobbles.
Nostoc commune can fix nitrogen from the atmosphere and can therefore live in places where nitrogenous compounds are not readily available. Under adverse conditions, it can remain dormant for extended periods and revive when conditions improve and water becomes available. The desiccated colony is remarkably resistant to heat and repeated freezing and thawing. Basically, this little blob is much tougher than it looks!
The first time I learnt about Nostoc was through a reel by Tallulah Dsilva , where she picked some up and ate it growing on one of the plateaus in Goa. The very next day, in what felt like some mystical happening in my life, I was taking a walk in my neighbourhood after a bout of rain. I walked onto the patch of laterite rock right in my neighbourhood and, lo and behold, what do I notice? Nostoc!
At first, I ignored it, thinking it was just some squishy p**p. But I remembered the reel I had watched, so, putting aside my ick, I picked it up, smelled it and played around with its texture. And I knew I had finally met face-to-face the edible Nostoc I had seen on the reels.
Later, during my foraging walks accompanied by Devika Gowri