According to Tohoku University, Assistant Professor Fukasawa and his colleagues placed a piece of wood on which the mycelium of basidiomycete, which plays a major role in the decomposition of dead trees and fallen leaves, was settled on a plate-shaped soil, and the mycelium grew on the soil. At that stage, I placed a new piece of wood to feed on and observed it at a distance.

　As a result, when the mycelium was smaller than the settled piece of wood, it continued to search the surroundings without leaving the piece of wood, but when it found a piece of wood larger than the settled piece of wood, it ended the search around it. Concentrated on new pieces of wood and began to settle.
After culturing in this state for about a month, the originally settled pieces of wood were moved to another petri dish, and the mycelium that found the small pieces of wood remained settled on the original pieces of wood, so they started to grow again.On the other hand, the wood pieces in which the mycelium that found the larger piece of wood had settled did not grow because the mycelium had already been transferred to the new piece of wood.

　In addition, when new growth was seen from the pieces of wood, more hyphae grew in the direction in which they were originally fed.
Assistant Professor Fukasawa and his colleagues decide whether to move completely or stay with the original piece of wood based on the size of the newly found piece of wood, and think that they remember the direction of the new piece of wood to feed on.

Paper information:[The ISME Journal] Ecological memory and relocation decisions in fungal mycelial networks: responses to quantity and location of new resources