Jax. 1900.] BOTANICAL SOCIETY OF EDINBURGH o41 



lo. Diagram of vascular supply of pistil. — o. = ovule ; ov.w. = ovarian 

 ■wall : s.i'. = stylar vessels ; f.c. = funicular vessel ; c.c. = chalazal cup ; 

 i/.i\ = dorsal vessel. 



14. Pistil showing basal flange. — h.f. formed by expanded epidermal 

 cells; i\k. = ventral keel. 



15. Ventral, and 1(!, profile view of stigma, .showing the ventral 

 groove. 



17-23. Outline drawings of pistils. — 17 = laciniosa ; 18 = viscosa ; 

 19 = kurdicd ; 20 = Ilookerknia ; 21 = Fcnzlii ; 22 = approximata ; 

 23 = rtijx'stris. 



The Eelation between the Lenticfxs and Adven- 

 titious EOOTS OF SOLANUM DULCAMARA. By JaMES A. 

 Terras, B.Sc, Lecturer on Botany, Edinburgh. (With 



Plates.) 



(Read 11th January 1900.) 



The existence of a definite relationship between adven- 

 titious roots and lenticels was recognised for the first 

 time in 1826 by De Candolle (3), as the result of an 

 investigation into the modes of rooting exhibited by a 

 number of cuttings taken from the most varied species 

 of woody plants : and subsequent authors, though differing 

 widely as regards the degree of interdependence of these 

 structures and the functional causes which underlie the 

 connection between them, have never denied the primary 

 fact that the great majority of those lateral adventitious 

 roots, which under favourable conditions are found growing- 

 out from the surface of many woody stems, take their 

 origin below lenticels. 



Stahl (7), in his classical work on the development and 

 anatomy of lenticels, cited Solanum Dulcamara as a species 

 in which nearly all the adventitious roots arise below 

 lenticels, but attempted no explanation. 



fourteen years later, Beijerinck (2) called attention to 

 the remarkably large number of root rudiments occurring 

 on the stem of this plant, and to the facility for vegetative 

 propagation which it in consequence possesses, but made 

 no reference to the connection between these roots and 

 the lenticels, which, indeed, he scarcely mentions. 



Klebahn (4), in 1884, figured a lenticel of S. Dulcamara, 

 but made no mention of the subjacent root, and the first 

 connected account of the relationship in which these two 



