The mushroom is directly related to the field eryngo (Eryngium campestre, E. maritimum). This is an annual perennial plant of an invasive nature that colonizes uncultivated or recently abandoned lands and which has a tuberous root that can descend various meters into the soul. The plant properly speaking emerges in spring and is usually not higher than half a meter.
The field eryngo appears in spring from roots or rhizomes generally already formed in previous years.
When the seeds mature towards the end of summer or early autumn, the aerial part dries out and ends up detaching itself from the root over the course of the autumn and winter, although some examples may last until spring, and it is common to see these dried parts of the plant tumbling over flat fields blown by the wind. The tuberous root, meanwhile, remains active and when spring comes it sprouts a new field eryngo, and this apparently occurs over several years. The field eryngo is known by different names depending on the location (cardo corridor, cardo yesquero, cardocuco, cardo borriquero, cardo panical, cardo setero, cardo cabruno, etc.).
When removing the mushroom, we occasionally also pull out part of the root of the field eryngo.
The mycelium feeds on these considerably developed rhizomes and then mushrooms later appear.