Ontotokantaiset

Ontotokantaiset refers to a classification of fungi characterized by their hollow stipes, or stems. This anatomical feature distinguishes them from other fungal groups where the stipe is solid or pithy. The term itself is derived from the Greek words "ontos" meaning hollow and "kantos" meaning stem. While not a formal taxonomic rank, "ontotokantaiset" is often used descriptively in mycology to group species that share this particular morphological trait, facilitating easier identification and study.

Many species within the genus *Macrolepiota*, commonly known as parasol mushrooms, exhibit hollow stipes. Similarly, some species of *Agaricus* (true mushrooms) also possess this characteristic. The hollowness of the stipe can vary in extent, from a slight cavity to a completely hollow tube. This feature is often a result of the internal tissues developing differently during the mushroom's growth. The function of a hollow stipe is not fully understood, but it may relate to spore dispersal, structural support, or resource allocation within the developing fruiting body. Mycologists often examine the stipe's internal structure as a key diagnostic feature when identifying fungi.