W. Carruthers—TJie Forests of the Coal Period. 297 



which is divided into two portions, an inner consisting of large 

 spherical and thin-walled cells, and an outer made up of regularly- 

 arranged elongated cells with a small diameter. The vascular cylin- 

 der is penetrated by radiating meshes through which the vascular 

 bundles passed that supplied the leaves. The outer surface of the 

 stem is covered with the sijirally arranged and beautifully marked 

 stigmata of the fallen leaves. The stem branches repeatedly in a 

 dichotomous manner. The younger branches are densely covered 

 with small lanceolate leaves, having a single median vein. 



Plate III. — Fruits of Selaginella. and Tkiplosporites. 



Fig. 1. Selaginella spimclosa, A. Braun. 2. Scale and sporangium fi-om the upper 

 portion of the cone. 3. Antheridian microspores from ditto. 4. Macrospore. 5. 

 Scale and sporangium from the lower part of the cone containing macrospores. 6. 

 Triplosporttes Brown a, Br ougn. 7. Three scales and sporangia of ditto. 8. Micro- 

 spores from the sporangia of the upper part of the cone. 9. Macrospore from the 

 sporangia of the lower part (drawn from Brongniart's description aud measurements). 

 10. Scales and sporangia of a cone of Flemingites. 



The fruit is a cone composed of imbricated scales arranged spirally 

 on the axis like the true leaves, and beaiing the sporangia on their 



