Production of the first and all the successive microconidia in Fusarium spp. section Liseola is enteroblastic from the phialide. The conidium initials are pushed out through a sometimes thickened neck region of the phialide. The inner wall of the phialide produces the conidium wall in a wall building zone (ring zone) in the neck of the phialide. The inner wall layer of the phialide is continuous with the inner wall layer of the conidium from which the middle and outer wall layers of the conidium are formed. This is contrary to current concepts that the outer wall layer forms the inner wall layers. Since no outer wall remnants are deposited in the phialide opening it means that large numbers of successive microconidia are produced without proliferation of the phialide or plugging of the opening. The implications of this for the definition of enteroblastic conidiogenesis is discussed. Macroconidia are also produced enteroblastically in a mode corresponding to that of microconidia.