298 Bozt/er. — Ophioglossum (C heir og loss a) palmatum , L, 
Figs. 7-10. Photographs of successive transverse sections through a young fertile leaf. Fig. 7 
is at the level of insertion of the lowest spike, which is seen to be median. Fig. 8 shows four spikes 
in two groups, right and left of the median plane. Fig. 9 shows a higher section traversing two 
spikes only, which are clearly intramarginal. Fig. 10 is a transverse section of the leaf above the 
spikes, showing projecting margins similar to those already seen in Fig. 9. x 48. 
Figs. 11, 12. Detail of segmentation of the marginal region of a fertile leaf, showing the T-type 
of division, but not with constant results, x 125. 
Fig* A very young spike, as seen in a transverse section of the parent leaf, from which it 
arises in an intramarginal position. It results from the outgrowth of a number of cells, x 125. 
Fig. 14. A spike from the same leaf, but lower down, and inserted in a median position. It 
shows a rather more advanced state, thus indicating that there is an acropetal succession in the 
formation of the spikes, x 125. 
Fig. 15. Transverse section from an older leaf, showing a young spike in a distinctly intra- 
marginal position, x 125. 
Fig. 16. Transverse section of the middle region of a fertile leaf, cutting obliquely through the 
insertion of three spikes. This indicates the irregularity of their position while young, x 125. 
Fig. 17, I-IX. A series of fresh drawings from the sections of the fertile leaf described in the 
‘ Annals of Botany ’, 1904, p. 210, PI. XV. Figs. I— III show the origin of the vascular supply to 
the lowest median spike. Figs. IV-IX show the same for the two lateral spikes. It will be noted 
that in either case the number of the strands is ultimately three. 
Fig. 18. Portion of the leaf of the large dried specimen from Jamaica, bearing to the left the 
fifth spike, and to the right the sixth, the latter being the smaller. The transverse sections of their 
stalks are also shown ; the fifth is traversed by three strands, the weaker sixth only by one. x 2. 
Fig. 19, I-V. Successive transverse sections showing the origin of the vascular supply to the 
fifth spike. 
Fig. 20, I- VII. Successive transverse sections showing the origin of the vascular supply to the 
sixth spike. 
Fig. 21 a, b. Transverse sections through the petiole of 0 . pendulum ^ a , lower down, b , higher 
on the same part,, showing how completely the margin as marked by vascular characters is 
obliterated. Drawn freehand. 
Fig. 22, I-X. Successive transverse sections through the petiole of 0 . reticulatum , showing 
origin of the vascular supply to the fertile spike. Section I is the lowest. Drawn freehand. 
