Manchester Memoirs, Vol. li. (1907), No. 8. 3 



authors. It can, however, be seen in Text-fig. 3 of the 

 present communication, drawn from a longitudinal section 

 of Lepidodendron selaginoides which shows the passage 

 of the parichnos canal, its tissue being defective, into the 

 space occupied formerly by the mid-cortex of the stem. 



o.c. — 



^v, c. 



S. *w.c 



$ "Wt_ 



Fig. 3. — Longitudinal section through the stem of Lepidoden- 

 dron selaginoides showing the parichnos strand {par) in continuity 

 with the remains of the mid-cortex {m.c). s.m.c. = space left by 

 defective middle cortex, v.b. = vascular bundle running from central 

 cylinder to outer cortex (o.c.) and accompanied below by the parichnos 

 strand. 



A figure showing the parichnos strand of Lepidophloios 

 fuliginosus, consisting of large rounded parenchymatous 

 cells, joining the well-preserved middle cortex of the axis 

 was figured by me (103) in the Transactions of the Linnean 

 Society {pi. 26, fig. 15). 



Interest in the nature and function of the parichnos 

 has been renewed by the recently completed account by 



