Article: Fertile Rhyniophytina from the Lower Devonian of Britain

A new genus Steganotheca is erected to include plants from the Downtonian of South Wales with naked dichotomously branching axes and terminal sporangia, which are longer than wide, sharply truncated apically, and with tapering bases. Comparison is made with other members of the Rhyniophytina (Banks 1968). Sterile Silurian axes probably belonging to the same genus are briefly mentioned. The first occurrence of Cooksonia in the Lower Old Red Sandstone of Scotland, consisting of naked dichotomously branching axes terminating in oval to circular sporangia, is described from the Cairnconnan Group of the Lower Devonian in Angus; it is placed in a new species.