614 
MR. F. 0. BOWER OX THE COMPARATIVE MORPHOLOGY OF THE 
Dioon eclule. 
Fig. 32. Leaf showing pinnae decreasing successively in size towards both the apex 
and the base. X 20. 
l\Iacrozamia Miqueli. 
Figs. 33-5. Successive stages of development of the leaf, showing the origin of the 
pinnae in basipetal order. X 20. 
Fig. 36. Longitudinal section of a leaf including one lateral row of pinnae, seen from 
the inner side. X 20. 
Fig. 37. Apex of the phyllopodium of a rather older leaf, with three pinnae. X20. 
Enceplialartos Barteri. 
Figs. 38, 39. Successive stages of development of the leaf showing exclusively basipetal 
order of succession of the pinnae. X 20. 
PLATE 40. 
Cei'a tozaniia Mexicana. 
Fig. 40. Young leaf with the basal flaps (stipules) removed: transverse connexion of 
them across the face of the phyllopodium not yet apparent. Basipetal 
order of succession of the pinnae. X20. 
Stangeria paradoxci. 
Figs. 41, 42. Young leaves before the appearance of the pinnae. X 20. 
Fig. 43. Young leaf, ventral aspect : the sheath has been removed. X 20. 
Fig. 44. Apical bud of a young plant, showing the sheathing stipule. X2. 
Fig. 45. Young pinnae. X 20. 
Fig. 46. Ventral aspect of a young leaf, showing two equal pinnae at apex. X 4. 
Gnetum Gnemon. 
Fig. 47. Axillary buds ; the larger one shows a leaf ( l ) in ventral aspect, with 
acuminate apex. X20. 
Fig. 48. A bud in longitudinal section, which cuts the two leaves through their 
median planes. X20. 
Fig. 49. Leaf in dorsal aspect, 1, 2, 3, 4, the points at which the corresponding 
sections of fig. 50 were cut. X 20. 
Fig. 50. 1, 2, 3, 4, successive transverse sections of the leaf at points 1,2, 3, 4, in the 
preceding figure, showing the relative position and size of tire wings and 
the midrib. X 20. 
Fig. 51. Transverse section through a young wing of the leaf. X 175. 
