62 DESCRIPTIVE INDEX TO THE PLATES. 



FIG. PLATE PAGE 



78. XIII. A specimen from the Newcastle Museum of the Stigmaria stellata of Groeppert . 40 



79. XIII. Transverse section of a Stigmarian rootlet in which the rootlet bundle and its 



rootlet cylinder,/, is united to the inner side of the rootlet-cortex, g, by a 

 cellular lamina,/", running longitudinally through the rootlet . 32 



80. XIV. View, taken obliquely from above, of a magnificent Stigmaria ficoides recently dis- 



covered at Clayton near Bradford, and now in the Museum of the Owens College, 

 Manchester . . . . . . .44 



