Nostoc is not an alien lifeform, nor is it a plant, algae, or bacterium. Instead, Nostoc is a cyanobacterium. Cyanobacteria are like bacteria in that they are microscopic, single-celled organisms that contain no cell nucleus.
Extension: What is that green slime in my lawn?
![](https://forsythnews.cdn-anvilcms.net/media/images/2021/08/06/images/Nostoc2lr.max-1200x675.jpg)
![Nostoc](https://forsythnews.cdn-anvilcms.net/media/images/2021/08/06/images/Nostoc2lr.max-752x423.jpg)