SPHENOPHYLLEAE 109 



of considerable size (Fig. 46, A), from which the two 

 sporangia hung down side by side, towards the axis of 

 the cone. 1 It appears that the pedicels in this species 

 were short, and that they were arranged in three 

 concentric verticils, on each whorl of bracts — another 

 apparent difference from Sphenophyllum Dawsoni. The 

 pedicel, which much resembles a sterile bract in structure, 



Fig. 45. — Bowmanites Romeri. Part of transverse section of cone, br, bracts ; pcd 

 pedicel of sporangiophore ; sm, the two sporangia belonging to it. At a the lamina 

 of a sporangiophore is shown. X 10. After Solms-Laubach. 



is traversed by a vascular bundle, which, where it enters 

 the scale at the top, divides into two branches to supply 

 the two sporangia (Fig. 46, A). The anatomical struc- 

 ture of the sporangiophore, allowing for the greater size 

 and complication associated with the presence of two 

 sporangia instead of one, closely resembles that of 

 Sphenophyllum Dawsoni (Fig. 46). The sporangium has 

 a wall several cells in thickness ; in 5. Dawsoni this is 



1 In the transverse section (Fig. 45) the pairs of sporangia {sm) are 

 shown, with the pedicel {pcd) between the two sporangia, and on their 

 outer side. 



