![Nostoc is a jelly-like substance with multiple common names like star jelly and witch’s butter. In its hydrated, gelatinous, green state, it can be a safety hazard. Slippery when wet, Nostoc dries into a black crust that can prevent stolons from rooting, or “tacking,” into the soil, delaying the growth and spread of turfgrass.](https://secure.caes.uga.edu/news/multimedia/images/4407/Nostoc.jpg)
Nostoc Algae
Recent dry weather encouraged the use, and possible overuse, of irrigation systems. Followed by tropical conditions characterized by heavy rainfall and humidity, there have been reports of a jelly-like substance growing in turf.