390 Bower.’ — The comparative examination of the 
STEMS. 
Trichomanes radicans , Figs. 18-21. 
Fig. 18. Longitudinal section through the apex ( X35) : ap, the apex. ax, the 
axillary bud. /, the leaf. 
Fig. 19. Transverse section showing apical meristem in plan : l, young leaf. 
The arrows indicate the vertical direction as the plant grew ( x 130). 
Fig. 20. Longitudinal section of the apex of the stem (x 130). 
Fig. 21. A very young axillary bud in longitudinal section : the arrow indicates 
the direction of the apex of the main axis ( x 130). 
Amphicosmia Walker ae. 
Fig. 22. Apical meristem of stem seen in plan ( x 130). 
Osmunda regalis , Figs. 23-26 (X130). 
Fig. 23. Apex of stem seen in plan. /, young leaf. older leaves. Initial 
(#) of regular form, segmentation regular. 
Fig. 24. Ditto, initial less regular in form, and segmentation less regular. 
Fig. 25. Ditto, apparently no single initial. 
Fig. 26. Apex in median longitudinal section : the succession of segments is not 
clearly to be seen. 
Angiopteris evecta , Figs. 27-29 ( x 130). 
Fig. 27. Apex of stem seen in plan ( x 130) : apparently four initials ( x , x). 
Fig. 29. Apex of stem in median longitudinal section. 
Marattia fraxinea. 
Fig. 28. Apex of stem as seen in plan : the number of initials is uncertain ( x 1 30). 
LEAVES. 
Trichomanes radicans, Figs. 30-32. 
Fig. 30. Young leaf as seen from above when projecting only slightly from the 
surface of the stem : the arrow points to the apex of the stem : m, m — marginal 
cells. (X163). 
Fig. 31. Part of a tangential section of the stem, passing vertically through a 
young leaf, and showing its first segmentations ( x 130). 
Fig. 32. Median longitudinal section of leaf : the arrow indicates the direction 
of the apex of the stem ( x 130). 
Trichomanes reniforme. 
Fig. 33. Apex of the leaf showing the T division of the initial cell, the identity 
of which is thus lost. ( x 130). 
Osmunda regalis , Figs. 34-35. 
Fig. 34. Apex of leaf seen in plan, s, sextant walls. 0, partial initial. The 
arrow shows in this and subsequent figures the direction of the apex of the stem. 
Fig. 35. Median longitudinal section of the apex of a leaf. 
