88 



Transactions. 



VI. Bulbils on Detached Leaves. 



In the same material in which the vegetatively produced plants de- 

 scribed in the last section were found I discovered a large number of young 

 plantlets of the same species (L. ramulosum) developing on detached leaves. 

 I could not ascertain for certain whether these leaves had become detached 

 from mature plants or from young sexually produced plants of the previous 

 season. The material dissected contained many old detached roots and 

 rootlets. A somewhat dry year had intervened since the previous season, 

 and it is possible that a colony of young plants, or perhaps a mat of adult 



Fir;s. 14-18. — Lycopodiwm ramulosum. Adventitious plantlets developed as buds from 

 detached leaves. Figs. 14 and 15 X 12 ; figs. 16-18 x 10. 



Figs. 19, 20. — Lycopodium ramulosum. Detached leaves bearing daughter plantlets, and 

 showing bulbous swellings in their lower portions. X 10. 



plants, had gradually died off, and that the conditions had stimulated the 

 adventitious budding of their detached roots and leaves. An adventitious 

 bud on a leaf shows first as a small roundish green cushion of meristematic 

 tissue (fig. 14), which has originated probably from one or more epidermal 

 cells. This cushion develops into a roundish or egg-shaped cell-mass, which 

 gradually elongates, and on which at an early stage rhizoids arise (fig. 16). 

 The attachment of the young bud to the parent plant is clear from fig. 15, 



