ORGANIZATION OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 775 
PLATE 23. 
Fig. 8. Part of a transverse section to show anomalous secondary tissues in the pith, 
«*,, normal secondary wood; 7.,7., rays; px., protoxylem of normal primary 
xylem ; x., centripetal, «.’, centrifugal, part of primary xylem; «.°, anoma- 
lous medullary wood; cb.?, anomalous cambium; ph.°, anomalous phloém ; 
p.,p., pith, x 70. C.N. 1190 (see p. 722). 
Fig. 9. Part of a transverse section, to show a leaf-trace bundle in the intermediate 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
10 
11. 
12. 
13. 
ig, 14. 
15. 
position between pith and pericycle. /t., leaf-trace, with a large fan of 
secondary tissue; ph., phloém of the leaf-trace, continuous on the left with 
the phloém-zone (ph.”) of the stem; x.®, secondary wood of stem; «.3, «.%, 
patches of anomalous wood in trace-gap ; p., p., pith; pd., periderm. X 14. 
From one of the new Oldham specimens (D. H.§ ). (see p. 710). 
. Part of a transverse section, to show petiole in connection with the stem. 
From the same series as photographs 3 and 84, and intermediate between 
them. pt., petiole; fb., its double bundle; sc.b., sclerotic axillary band 
(cf. photograph 4) ; d.c., Dictyoxylon cortex of stem ; /t., part of a leaf-trace 
bundle; *., secondary wood. x 7. Slide 56 (D.H. 8.) (see p. 725). 
Obliquely longitudinal section of the same petiole, when it has become free 
from the stem. pt.®, branch of the petiole; fb., /b., vascular bundles of 
main and branch petioles ; c., outer cortex ; 7.c., inner cortex ; @., é., cortical 
emergences. X 64. C.N. 1979 (see p. 725). 
Part of outer cortex of a petiole, to show an apparently glandular emergence. 
sc., sclerenchyma of cortex; ¢., emergence; g., supposed glandular tissue. 
x 100. ON, 139 (see p. 730). 
Part of a longitudinal section of a petiole, passing through the bundle, of 
which about half is shown. px., protoxylem ; «., centripetal, «.’, centrifugal, 
part of xylem; ph., phloém; c., cortical tissue. x 70. C.N. 1985 (see 
p. 728). 
PLATE 24. 
Radial section through a bud-like structure. az., hollow axis of the whole 
structure; ¢., €., outgrowths, resembling the cortical emergences of Lygino- 
dendron. X20. C.N. 1859 (see p. 732). 
Tangential section of the same. .’, bases of the outgrowths. x 20. 
C.N. 1858. 
Leaflet in vertical section. ep., epidermis; h., hypoderma ; p.t., palisade 
tissue ; s.t., spongy tissue ; v.b., vascular bundles, the one in transverse, the 
other in longitudinal, section, X 100. O.N, 1197 (see p. 730). 
