A spore is reproductive structure of a certain mushroom that is meant to be dispersed for reproduction. These spores have the ability to thrive for long periods in unfavourable conditions while waiting for the conditions to turn favourable. Resulting in asexual reproduction where each spore grows into a new organism under the favourable conditions, Creating mycelium.
One of the most common colloquial terms for psilocybin mushrooms, is shrooms or magic mushrooms. The best way to identify a mushroom is by its spore print. One part of the identification process is the creation of a spore print, which requires placing a mushroom cap gill side down on a piece of paper or foil.
These mushroom spores through the use of microscopy, not only identify the wild mushrooms, they can also be used in the cultivation of magic mushrooms, where it is legal to do so.
Psilocybin and psilocin are the active illegal compounds found in these mushrooms, and spore prints do not contain either of these chemical compounds, this makes mushroom spores legal to possess. In most places around the world. But be sure to check your local laws before ordering.