i 9 o STUDIES IN FOSSIL BOTANY 



is produced into a thick dorsal lobe below, and a larger 

 ventral lobe above (see Fig. 79). The sporangia are 

 not elongated, but ovoid or spherical, and not in any- 

 way attached to the pedicel, but inserted, by means of 



Fig. 79. — Spencerites insignis. Somewhat diagrammatic radial section showing two of 

 the sporophylls in connection with the axis. On the lower sporophyll the sporangium 

 is seen, attached at its distal end to the ventral outgrowth ; a few of the winged 

 spores are shown. After Miss Berridge. 



a short stalk at the distal end, on the upper surface of 

 the ventral lobe (Fig. 79). No ligule has been observed. 

 The structure of the sporangial wall is also quite 

 different from that of Lepidostrobus, for it consists of 

 prosenchymatous cells, elongated in the plane of the 



