The large tree shown in transverse section in fig. 181, A, has lost its leaf-cushions; the bark, as seen in the lower part of the photograph, presents a fissured appearance like that with which we are familiar on an old Oak or Elm stem. A radial longitudinal section through the phelloderm revealed the existence of a crushed leaf-trace passing outwards in an approximately horizontal course accompanied by a strand of parenchymatous tissue[361] having the characteristic structure of a parichnos. It is probable that the surface of this partially decorticated stem differed in appearance from that of an old _Sigillaria_ (cf. fig. 198) in the much smaller and less conspicuous parichnos strands. In addition to the large stems of _L. Wünschianum_ from Arran and Dalmeny numerous examples of smaller axes from the former locality are represented in the Williamson collection (British Museum). Some of the twigs are characterised by a solid stele (protostele) giving off numerous leaf-traces accompanied by short spirally thickened tracheids like those which occur at the outer edge of the primary xylem in the larger stem: these extend into the leaf where they are arranged round the vascular bundle like the transfusion tracheids[362] in many recent conifers. The surface of these smaller shoots bears large leaf-cushions which are seen in longitudinal section to have the form characteristic of _Lepidophloios_. It is worthy of note that a section of a bifurcating axis of this species from the Calciferous Sandstone of Craigleith (British Museum Collection[363]), although its diameter is 19 × 14 cm., shows no signs of secondary wood. This late appearance of secondary xylem and other anatomical features suggest the possibility of the specific identity of _L. Wünschianum_ and _L. Harcourtii_[364]. In 1871 Binney[365] described a specimen of a heterosporous cone, _Lepidostrobus Wünschianus_, from Arran exhibiting the ordinary features of lepidodendroid strobili; this was probably borne by _Lepidodendron Wünschianum_. 7. _Lepidodendron macrophyllum_ (Williamson). Fig. 186, C.