SIGILLARIA AND STIGMARIA. 



147 



As to the fructification of Sigillaria, it appears to me pretty certain tliat it will prove 

 to be something like that of Lepidodendron, except that the structure of the axis of the 

 cone will show that it was composed of barred tubes and cells similar to those found in 

 Sigillaria vascularis, and not of orthosenchymatous tissue, as has been proved to be the 

 case in Lepidodendron Harcourtii, the first and only Lepidodendron in Avhich the 

 structure of both stem and cone has been well ascertained. The structure of the 

 specimen No. 19, described at page 49 of this Monograph, as well as the cone mentioned 

 and described in my paper in the ' Philosophical Transactions,' seem to indicate this as 

 most probable. 



The outside of the last-named cone, which came from the nodules in the roof and not 

 in the seam of the " Upper Foot Coal" near Oldham, where most of the specimens are 

 found, was not so Avell illustrated in the woodcut as it might have been. The bracts 

 supporting the sporangia are arranged around the column of the cone in vertical series 

 and quincuncial order, differently from those in Lepidodeyulron Harcourtii, and exactly 

 resembling the arrangement of the leaf-scars in Sigillaria orgaimm. In fact, the ribs, 

 furrows, and scars shown on the outside of the column of this cone are in all respects 

 similar to those found on a small stem of S. organum. 



