58 



BOTANICAL GAZETTE 



[JULY 



exists in certain species of Lycopodium. The roots arise in acropetal 

 succession at any point of the stele of the stem- Instead of penetrat- 

 ing the cortex at once and emerging as aerial roots, they turn down in 



Fig I — Lycopodium pithyoides 



the cortex, boring canals through long stretches of cortex, and emerge 

 finally at or near the base. This habit is associated with erect forms 



Lvcopod 



A similar habit is 



described in the ^larattiaceae, Sachs (9) having given a brief de- 

 scription of its occurrence in Angiopleris evecta^ in which the roots are 

 said to bear a definite relation to the leaf bases. 



