458 Proceedings of the Royal Irish Academy. 



Plate XIV. 



Fig. 19. — Longitudinal section of an axillary bud of Bendrohium 

 teretifolium. At the top of the axis is to be seen the 

 rudimentary foliage leaf. Beneath this are 10 scale- 

 leaves. X 10. 



Fig. 20. — Longitudinal section through the base of a lateral branch 

 of V. teres. In the angle between the lateral branch 

 and the main axis is to be seen part of the ruptured 

 tubular petiole of the leaf which subtended the bud. 

 At the base of the branch are the remains of the two 

 first leaves, x 4. 



Fig. 21. — Transverse section of the apex of the leaf of Dendrobium 



teretifolium, where the axial passage comes to the 



surface of the leaf, x 20. 

 Fig. 22. — Transverse section of the bases of the petioles of the leaves 



covering the apex of V. teres, x 15. 

 Fig. 23. — Transverse section of the leaf of Dendrolium teretifolium 



about the middle, showing the position of the axial 



passage in the leaf, x 4. 



Figs, 24, 25, 26, 27, 28, 29. — A series of transverse sections passing 

 from the lamina of the leaf to a point in the stem 

 beneath its insertion at the node of V. teres. The 

 figuring of the bundles shows the fusions and divisions 

 which take place in this space. The section from 

 which fig. 28 was drawn passed through the base of an 

 adventitious root (which appears above to the left) and a 

 lateral branch, seen below, x 8. 



Fig. 30, 31, 32, 33. — A series of transverse sections of the leaf of 

 Brassavola Hadweni passing downwards from the apex 

 to the base, showing the gradual infolding and inclusion 

 in the central tissues of the leaf of the groove-like 

 upper surface, x 8. 



