Arthropitys cf. renaultii Boureau, 1964

(Fig. 4A, E)

This small stem, about 3 mm in diameter, shows an excellent preservation of the tissues. There are 17 primary xylem strands, with circular carinal canals, surrounding the pith (see detail on Figure 4E). The absence of any secondary xylem supports its interpretation as a very young twig. Other examples of similar small stems have been found with leaves attached. These stems are referred with some reservations, to A. renaultii Boureau, 1964 from the Lower Permian of Autun that represents a similar young stem devoid of secondary xylem, but with a larger number (34) of primary xylem strands and with a proportionally narrower cortex. In the present specimen the outer cortex is sclerenchymatous with alternating parenchyma (arrow, Fig. 4E) but the inner cortex shows larger cells (C, Fig. 4E).