Abstract: Uncatoella verticillata was first described by Li Xingxue anti Cai: Chongyang in 1978: from the Lower Devonian of Yunnan, China. It consists of slender internodes and swollen nodes with whorled branchlets. Li and Cai tentatively considered it as Incertae sedis in the' algae, because the reproductive organs were not found. The material described in this paper provided the new information on the reproductive organs (oogonia with vertical and segmented enveloping cells), which were collected from the original locality of Uncatoella in the Qujing region of Yunnan. On the basis of its gross morphology (vegetative and reproductive parts), Uncatoella can be assigned to Sycidiaceae of Sycidiales.

Key words: Lower Devonian, Uncatoella verticillata, Sycidiales