ROOTS OF CALAMARIEAE 



43 



was not at once accepted, because he had not obtained 

 the evidence of actual continuity at that time. Later 



Fig. 15. — Catamites, sp. Part of transverse section of a large root. /•, pith ; -i' 1 , 

 primary centripetal xylem; x\ secondary xylem ; />h, phloem; en, endodermis ; /, 

 lacunae of cortex ; 7i', cellular walls separating [hem ; c, outer cortex. Magnified. 

 After Renault. 



on — in 1 893 — Renault described certain beautiful 

 specimens of Calamites, which afforded the proof 

 required, for in them the Calamitean stem bears 



