_Pleuromeia Sternbergi_ is represented by casts of vegetative and fertile axes, but the preservation of the latter is not sufficiently good to enable us to draw any very definite conclusions as to the nature of the reproductive organs. Casts of the stems reach a length of about 1 metre and a diameter of 5–6 cm., or in some cases 10 cm.; all of them are in a more or less decorticated state, the degree of decortication being responsible for differences in the external features which led Spieker[160] to adopt more than one specific name. Fig. 134, A, represents a sketch, made some years ago, of a specimen in the Breslau Museum which contains several examples of this species, among others those described by Germar in 1852. The cylindrical cast (38 cm. long by 12 cm. in circumference), which has been slightly squeezed towards the upper end, bears spirally arranged imperfectly preserved leaf-scars and the lower end shows the truncated base of one of the short Stigmaria-like arms characteristic of the plant. As shown clearly in a specimen originally figured by Bischof and more recently by Potonié[161], the stem-base is divided by a double dichotomy into four short and broad lobes with blunt apices and bent upwards like the arms of a grappling iron (fig. 134, D). The surface of this basal region is characterised by numerous circular scars (fig. 134, D; 4 scars enlarged) in the form of slightly projecting areas with a depression in the centre of each. These are undoubtedly the scars of rootlets, remains of which are occasionally seen radiating through the surrounding rock. As seen in fig. 134, D, _a_, the fractured surface of a basal area may reveal the existence of an axial vascular cylinder giving off slender branches to the rootlets. [Illustration: FIG. 134. _Pleuromeia Sternbergi._ A. Cast of stem in the Breslau Museum (⅓ nat. size). (A.C.S.) B. “_Sigillaria oculina_” Blanckenhorn. (After Weiss). C, D. Leaf-scars and base of stem: _a_, vascular tissue. (After Solms-Laubach.)]