Scottish Lower Carboniferous Plants: Eristophyton waltoni sp. nov. and Endoxylon zonatum (Kidston) Scott from Dunbartonshire

Abstract

Two petrified stems are described. One, Eristophyton waltoni, which only differs from E. beinertianum (Goeppert) Zalessky, in details, provides new information about the leaf trace and its occlusion after leaf fall. The other, identified as Endoxylon zonatum (Kidston) Scott, differs from the Type chiefly in showing no growth rings; it indicates the range of variation in the genus and an emended generic diagnosis is given. Both genera, formerly included in the Calamopityaceae, are now tentatively referred to the Cordaitales.