258 BOTANICAL GAZETTE [OCTOBER 
axis of the same species of Equisetum, showing the absence of a foliar gap corre- 
sponding to the leaf-trace which lies in the cortex. X25. 
1G. 5.—Longitudinal section through a vegetative node of the same species 
of Equisetum, showing the departure of the leaf-trace without causing any gap 
in the supranodal wood. 
PLATE XVIII 
Fic. 6.—Transverse section of the stem of Tmesipteris tannensis. X15. 
Fic. 7.—Tranverse section of the same, showing the relation of the outgoing 
traces to the central enna X30. 
Fic. 8.—Copy of a figure from BERTRAND, showing the departure of the traces 
of the lower mite from the upper region of the peduncular strands in Phyl- 
loglossum 
Fic. 9. rofl eneveries section of part of the central cylinder of Lepidophloios 
Harcourt. 
Fic. 10.—Transverse section through the middle region of the cone in Phyl- 
loglossum, showing an relation of the leaf traces to the central cylinder. X60. 
Fic. 11.—Transverse section through the central region of ee cone in another 
example of Physical showing two apparent “foliar gaps.” X60. 
IG. 12.—Transverse section through the same cone slightly lower down, 
showing the connection of the foliar strand with the side of the apparent foli 
gap. X60. 
Nore.—Figs. ro, 11, 12 are all made from herbarium specimens. In fig. 12 
the action of caustic alkali has not quite restored the size of the cells in the gap on 
the right of the central cylinder; it should appear the same size as that shown op 
the right of fig. I 
