CARBONIFEROUS LYCOPOD3 AND SPHENOPHYLLS. 115 



the main arms of the rhizome. On a larger specimen (No. 2340) 

 the rootlets are 3 mm. wide. 



When the epidermal layer is removed, the irregular flexuous 

 wavy lines are especially prominent (No. 2335). They do not 

 appear to be due to shrinkage, but to a dictyoxyloid structure in 

 the sub-epidermal layer of the cortex, to which attention has 

 already been called when referring to the structure of Stigmaria 

 (Stigma7'iopsis) Brardi, Renault. 



The specimen figured by Prof. Williamson l as a Stigmarian 

 root, belonging to the Hutton collection in the Museum, Barras 

 Bridge, Newcastle-on-Tyne, should also be referred to Stigmari- 

 opsis, and appears to have the same characters as the Monckton 

 Main specimens. 



XIII. Spencerites, Scott, 1898. 



1898. Spencerites, Scott. Proc. Roy. Soc, Vol. LXIL, p. 166. 



1898. Spencerites, Scott. On Spencerites, a new genus of 

 Lycopodiaceous cones from the Coal Measures, founded 

 on the Lepidodendron Spenceri of Williamson, Phil. 

 Trans., Vol. CLXXXIX., Ser. B., pp. 83-106, 

 Pis. XII.-XV. 



The genus contains two species — Spencerites insignis, Will, sp., 

 and Spencerites majuscidus, Scott — both from the Lower Coal 

 Measures. 



Spencerites differs from Lepidostrobus in several important 

 characters, but especially in the attachment of the sporangia. 

 The sporophylls are short, and formed of a sub-cylindrical pedicel 

 which expands into a large peltate lamina. Sporangia solitary 

 on each sporophyll and inserted by a narrow base on the upper 

 surface of the lamina, but free from the pedicel. 



In regard to the affinity of Spencerites Dr. Scott says : — " The 

 distal insertion of the sporangium .... may perhaps be 

 an indication that Spencerites represents a somewhat more 

 archaic type of Lycopodiaceous strobilus than that of Lepido- 

 strobus.' 1 



1 Monog. Stigmaria, PI. XIII., fig. 71. 

 2 Phil. Trans., I.e., p. 102. 1898. 



