386 Hickling . — The Anatomy of Palaeostachya vera . 
Fig. 2. Longitudinal (slightly oblique) section through node showing ‘arching’ of secondary 
tracheids over node. Section is not quite median through node. It shows the relation of ‘ disc ’ to 
node. D. = ‘ disc’; n. = node; Pt.xy. C. — protoxylem canal of bundle. W. 1573. x about 38. 
Fig. 3. Transverse section of axis at node. Note large amount of secondary wood ; absence of 
protoxylem canals. R. 143. x about 38. 
Fig. 4. Peltate expansion of sporangiophore. R. 31. x about 38. 
Fig. 5. Sporangiophore cut longitudinally, showing its bundle, Sp. tr ., in lower portion, where 
it adjoins cells of disc. R. 30. x about 38. 
Fig. 6. Oblique transverse section of part of disc showing curved sporangiophore-trace crossing 
it. Sp. tr. — sporangiophore-trace ; M. = tissue described at p. 376. Q. 336. x about 38. 
Fig. 7. Oblique ‘disc’ section. At right edge, section cuts near lower limit of ‘disc’ ; plane 
of section rises towards left edge. Note the ring of buttresses formed by the pairs of sporangiophore- 
traces and their accompanying sclerenchyma. Br. = base of bract ; ‘Z. Can . 1 = large ‘ disc canals 
‘ Sm. Cant — small ‘ disc canal ’ ( = torn-out sporangiophore-trace) ; Sp. — sporangiophore-stalks 
cut at various levels ; Sp. tr. = sporangiophore-trace, descending limb ; Sub-ep. Scler. = strand of 
sub-epidermal sclerenchyma. R. 30. x about n. 
Fig. 8. Oblique transverse section through lower portion of part of disc, showing large ‘ disc 
canal ’ half filled with parenchyma. Par. = parenchyma in ‘ disc canal ’ ; Phi. = secondary phloem. 
R. 140. x about 38. 
Fig. 9. Internodal transverse section. Above level reached by sporangiophore-trace. Shows 
small amount of wood in bundles as compared with that at nodes. Cf. Figs. 1 and 3. Q. 332. 
x about 38. 
Fig. 10. Bases of two sporangiophores just emerging from disc. Part of section, Fig. 7. 
M. — tissue described at p. 376 ; Pd. = periderm ; ‘ Sm. cant = ‘ small outer canal ’ ( = torn-out 
sporangiophore-trace). R. 30. x about 38. 
Fig. 11. Portion of internodal transverse section with cortex preserved. R. 142. x about 38. 
Fig. 12. Portion of transverse ‘disc’ section. Px. C. = protoxylem canal of main bundle; 
Sp. Px. C. — protoxylem canals of sporangiophore-traces (really more distinct than they appear 
in photo), see drawing, Fig. 16. Q. 336. x about 38. 
Fig. 13. Similar section at slightly lower level. Each of the three protoxylem canals is seen to 
be elongated. They are dividing into the canals of the main bundles and those of the sporangio- 
phore-traces. R. 34. x about 38. 
PLATE XXXIII. 
Fig. 14. Typical tracheids. A, annular, from sporangiophore-trace. Q, 337. x about 200. 
B , scalariform, from secondary nodal wood. S. 474. x about 280. C, pitted, from secondary 
nodal wood. R. 30. x about 280. 
Fig. 15. Transverse section through vertical portion of bract. Scl. — dorsal sclerenchyma. 
R. 32. x 66. 
Fig. 16. Uppermost bundle shown in Fig. 12. The protoxylem canals of the main bundle and 
the sporangiophore-trace are here clearly seen. Q. 336. x about 150. 
Fig. 17. Portion of sporangium wall in tangential section showing form of cells and* buttresses.’ 
R. 31. x 146. 
Fig. 18. Tissue accompanying sporangiophore-trace, in transverse section through ‘ disc.’ 
R. 144. x 120. 
Fig. 19. The sporangiophore-trace bundle shown in Fig. 6. Q. 336. x about 136. 
Fig. 20. Longitudinal section through node showing origin of bract-trace. Pt.xy. C. = proto- 
xylem canal, obliterated at node; D. — part of ‘ disc.’ W. 1573. x 70. 
Fig. 21. Longitudinal section showing course of sporangiophore-trace and its accompanying 
tissue. Slightly oblique. Pt.xy. C. — protoxylem canal of main bundle ; S.Pt.xy. C. = protoxylem 
canal of sporangiophore-trace ; Sp. — sporangiophore ; Br. ~ bract ; D. = * disc ’ ; D. C. = ‘ disc- 
canal.’ W. 1577. x 60. 
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