  In this paper we present an application of the groupoid theory to the study
of relevant case of material evolution phenomena, the \textit{process of
morphogenesis}. Our theory is inspired by Walter Noll's theories of continuous
distributions and provides a unifying and very simple framework of these
phenomena. We present the explicit equation, the \textit{morphogenesis
equation}, to calculate the \textit{material distributions} associated to this
phenomenon.
