( 176 ) 



largest (about 3 cms. long). The position of the leaves is alternating, 

 the innervation of the leaf the typical one for Gnetum Gnemon 1 ). 

 The leaflets on the first node as a rule remain scale-shaped; in some 

 cases, however, they develop to leaflets, differentiated into stalk and 

 blade. 



Although in the axils of the leaflets axillary buds are certainly 

 formed, I never saw the adventitious sprouts ramify themselves, 

 except in a single case, when, as I surmise, of the basal piece of 

 an adventitious sprout the terminal bud did not develop for some 

 reason or other, and instead the buds in the axils of the scale-leaves 

 sprouted. 



On a differentiation of histogens at the vegetative cone I have not 

 been able to form a definite opinion from my preparations of ad- 

 ventitious sprouts. 



The numerous attempts which I made, in order to induce the 

 adventious sprouts to produce roots, have all failed. This agrees with 

 the circumstance that in my preparations I have never been able to 

 discover anything that resembled root-formation. The sprout-carrying 

 leaves which had been planted in wet sand did not form roots either. 

 As far as I know formation of adventitious roots does not occur at 

 all with Gnetum Gnemon. 



A connection between the vascular system of an adventitious 

 sprout and the nerve system of the mother leaf is established by 

 procambial bundles, formed by cells of the tissue, situated between 

 the meristem and a leaf bundle. 



As a ride we find as the first indication of this vascular bundle 

 connection in the immediate vicinity of very young meristems even, 

 some tracheids and cells, changing into them. The degree of develop- 

 ment, reached at a certain moment by this vascular bundle connection, 

 is not directly dependent on the degree of development of the ad- 

 ventitious bud in question, but seems to me to stand in close relation 

 to the distance between meristem and leaf bundle and to the dia- 

 meter of this latter. When a complete connection has been established 

 we see the vascular bundles of the adventitious sprout within the 

 knob in which the bud has formed, bend towards each other and 

 unite with a more or less cylindrical group of locally formed vessels 

 and tracheids, the ramifications of which are connected with the 

 vascular bundles of the mother leaf. 



When describing the changes, macroscopically observed with a 



b Viz. Nr. 3 of the leaf nervations, distinguished by Karsten for the species of 

 Gnetum [G. Karsten, Untersuchungen iiber die Gattung Gnetum. I. (Ann. du Jardin 

 Bot. de Buitenzorg Volume XI. 1893. p. l'Ju— i218/J. 



