500 Gwynue- Vaughan. — On some Climbing 
position of each strand of protoxylem is still indicated by a group of small 
scalariform elements. Towards the very base of the petiole the promi- 
nences of the xylem strand become less marked, especially the lateral ones, 
and the adaxial sinus disappears (Text-fig. 2, B). 
The protophloem completely surrounds the xylem, but metaphloem 
elements only occur in groups on the abaxial flanks and in the adaxial 
sinus; the sieve-tubes are often in contact with the tracheae. Phloem 
fibres were not seen, but the small sieve-tubes near the prominences are 
especially thick-walled (Text-fig. 2, C ,f). 
The pericycle is two-layered opposite the positions of maximum 
development of the phloem, and one-layered elsewhere. 
The branching of the petiole (Text-fig. 2, D 1 " 4 ) essentially resembles 
that in L. scandens. The trace of the primary branch, which has no 
abaxial protoxylem, swings round (Text-fig. 2, D 5 ),so that its median plane 
is almost at right angles to that of the main trace (Text-fig. 2, D 6 ). 
