Conidiophore with conidia.
Conidia (basidiospores) borne in fours on a special conidiophore, the basidium.
With conidiophore (c), and E, F, Sections of young periyoung archicarp (as).
This very large group of plants is characterized by the possession of a special type of conidiophore - the basidium, which gives its name to the group. The basidium is a unicellular or multicellular structure from which four basidiospores arise as outgrowths; it starts asa binucleate structure, but soon, like the ascus, becomes uninucleate by the fusion of the two nuclei.