Part of a fairy ring in our garden. The difference in grass growth between where the mushrooms grew last year vs this year is especially visible this year.
Part of a fairy ring in our garden. The difference in grass growth between where the mushrooms grew last year vs this year is especially visible this year.
Clover is N deficiency indicator, too.
In mushroom cultivation, it is known that fruiting happens when myceluim growth is not possible anymore. Usually it means there is no space to expand. The rings certainly indicate that it is not geometry constrain that triggered fruiting, but something non-spatial - nutrient deficiency, toxic shock, temperature change, etc. There are many possible causes, some of them perfectly healthy - some late autamn fruiters almost always form rings.