Dadoxylon (Palæoxylon) antiquius, Dn.—A species with large medullary rays of three or more series of cells.
Lepidodendron corrugatum, Dn.—A species closely allied to L. Veltheimianum of Europe, and which is its American representative. This is perhaps the most characteristic plant of the formation. It is very abundant, and presents very protean appearances, in its old stems, branches, twigs, and Knorria forms. It had well-characterised stigmaria roots, and constitutes the oldest erect forest known in Nova Scotia.
Lepidodendron tetragonum, Sternberg.
L. obovatum, Sternb.
L. aculeatum, Sternb.
L. dichotomum, Sternb.
The four species last mentioned are comparatively rare, and the specimens are usually too imperfect to render their identification certain, but Lepidodendra are especially characteristic trees of this horizon.
Cyclopteris (Aneimites) Acadica, Dn.—A very characteristic fern, allied in the form of its fronds to C. tenuifolia of Goeppert, to C. nana of Eichwald, and to Adiantites antiquus of Stur. Its fructification, however, is nearer to that of Aneimia than to that of Adiantum.
Ferns of the genera Cardiopteris and Hymenophyllites also occur, though rarely.
Ptilophyton plumula, Dn.—This is the latest appearance of this Erian genus, which also occurs in the Lower Carboniferous of Europe and of the United States.