Fairy ring fungus

Several polyacetylenes have antibiotic properties and some are phytotoxic. Agrocybin (4.105), originally isolated from Agrocybe dura, is also formed by the fairy-ring fungus, Marasmius oreades, and it may be responsible for the death of grass. Their production as extracellular mycelial metabolites may thus facilitate the spread of the mycelium in a hostile environment. The dry-rot... 

Ayer, W.A. and P.A. Craw, 1989. Metabolites of fairy ring fungus, Afara mfM oreades. Part 2. Norsesquiterpenes, further sesquiterpenes, and argocybin. 67 1371-1380. 

---