Firerug inkcap

The Firerug inkcap (lat. Coprinellus domesticus) is a species of fungus in the Psathyrellaceae family. While it is primarily a saprotrophic fungus, it is of interest to horticulturists and agronomists due to its role in the decomposition of wood in garden environments and infrastructure.

This fungus typically colonizes decaying logs, old stumps, and wooden structures in contact with damp soil. It is commonly found on garden fence posts, raised bed frames, and in greenhouses where humidity levels remain consistently high, leading to the degradation of woody materials.

The primary diagnostic symptom is the emergence of small, bell-shaped fruiting bodies, usually growing in clusters. A distinct feature of this species is the presence of an orange-brown, felt-like mycelial mat at the base of the mushrooms, often referred to as the "ozonium."

The development of Coprinellus domesticus is favored by stagnant moisture, poor air circulation, and wood being in direct contact with organic-rich, damp ground. Once established, the mycelium penetrates the woody tissue, slowly consuming its structural components like cellulose.

The economic impact involves the structural weakening of garden wooden supports and installations. Preventive measures should focus on improving site drainage, ensuring wooden structures are treated with fungicidal wood preservatives, and keeping wood elevated off the soil to maintain dryness.