OF THE FOSSIL PLANTS OF THE COAL MEASURES. 
317 
PLATE XLIII. 
Fig. 16. Radial section of the inner parenchymatous bark in its matured state, enlarged 
50 diameters. 
Fig. 17. Radial section of the outer part of the prosenchymatous bark in its matured 
state, enlarged 40 diameters. 
Fig. 18. Tangential section of the leaf-petioles close to the outer surface of the bark, 
enlarged 2 diameters. 
Fig. 19. Transverse section of the centre of a young Lepidodendroid twig, about to 
branch dichotomously, enlarged 28 diameters. 
Fig. 20. Section of a large Diploxyloid stem branching like fig. 19, enlarged 2 diameters. 
Fig. 21. Transverse section of part of the ligneous zone of fig. 20, enlarged 40 diameters, 
exhibiting the young vascular growths. 
Fig. 22. Tangential section of some of the young vessels of fig. 21, enlarged 50 
diameters. 
PLATE XLXV. 
Fig. 23. Transverse section of a Lepidostrobus, enlarged 7 diameters. 
Fig. 24. Tangential section of a Lepidostrobus, enlarged 4 diameters. 
Fig. 25. Small portion of fig. 24, enlarged 45 diameters. 
Fig. 27. x, Section of a macrospore, enlarged 70 diameters; w, cluster of microspores, 
enlarged to the same scale. 
Fig. 27*. Single macrospore, external aspect, as an opaque object, enlarged 35 diameters. 
Fig. 28. Cluster of four sporangia from the base of a Lepidostrobus , and containing 
macrospores, enlarged 32 diameters. 
Fig. 29. Transverse section of the central axis or peduncle of a large Lepidostrobus , 
enlarged 10 diameters. 
Fig. 30. Longitudinal section of fig. 29, enlarged 10 diameters. 
PLATE XLV. 
Fig. 26. Microspores of fig. 25, magnified 800 diameters. 
Fig. 31. External surface of a young Lepidodendroid twig of the common type of fig. 1, 
enlarged 3 diameters. 
Fig. 32. External surface of a young Lepidodendroid twig of a rarer variety, enlarged 
3 diameters. 
Fig. 33. Transverse section of a young Lepidodendroid twig from Oldham, enlarged 
8 diameters. 
Fig. 34. Longitudinal section of the medullary axis of a young Lepidodendroid twig 
from Oldham, enlarged 46 diameters. 
Fig. 35. Transverse section of a young Lepidodendroid branch from Oldham, with 
large leaves, enlarged 4-| diameters. 
