STUDIES IN FOSSIL BOTANY 



FIG. 



36. Sphenophyllum quadrifidum. A. Radial section through a node. 



B. Transverse section of same stem. C. Transverse section 

 through a node. D. Transverse section of a portion of 



secondary wood ......-■ 9° 



37. Sphenophyllum plurifoliatum. Transverse section of stem through 



whorl of leaves . ... ■ 9 1 



38. Sphenophyllum flurifoliatum. Transverse section of older stem . 92 

 3g , „ ,, Radial section through part of 



secondary wood ... 93 



40. Sphenophyllum insigne. Transverse section of rather young stem 95 



41. Sphenophyllum Dawsoni. A. Diagram of cone in longitudinal 



section. B. Stele of axis in transverse section. C. Spores in 



superficial aspect . • io1 



42. Sphenophyllum Dawsoni. Longitudinal section of cone 102 



43. Sphenophyllum Dawsoni. Transverse section of cone 104 



44. ,, ,, Sporangiophore and its sporangium 106 



45. Bowmanites Rbmeri. Part of transverse section of cone . 109 



46. ,, ,, A. Lamina of sporangiophore. B. Longi- 

 tudinal section through upper part of sporangiophore . . no 



47. Sphenophyllum fertile. Diagram. A. Node in radial section. 



B. One lobe of sporophyll . . . ■ m 



48. Sphenophyllum majus. Forked sporophyll bearing four sporangia 113 



49. Cheirostrobus pettycurensis. Diagram. Transverse and radial 



section . 116 



50. Cheirostrobus pettycurensis. Part of radial section . 117 



51. ,, ,, Transverse section of axis of cone 119 



52. Lepidodendron elegans. Restoration of tree . . . 127 



53. Lepidodendron Ophiurus. A. Fragment of stem-surface. B. 



Leafy branch bearing a cone . . . 129 



54. Lepidodendron Veltheimianum. Portion of surface of stem . 1 30 



55. Lepidodendron. Leaf-base . ... . 130 



56. Lepidodendron Harcourtii. A. Transverse section of stem. B. 



Stele of same ... . 137 



57. Lepidodendron {Lepidophloios ?) Wunschianum. Transverse section 



from outer part of stele . . . 142 



58. Lepidodendron brevifolium. Transverse section of stem 144 



59. Lepidodendron selaginoides. Transverse section of young branch . 145 



60. ,, ,, Transverse section of stele . . 146 



61. ,, , , Part of radial section 151 



62. Lepidophloios, sp. A. Tangential section from the outside of a 



stem. B. A single leaf -base . . 156 



63. Lepidophloios, sp. Radial section of a leaf-base 159 



64. Lepidodendron Hickii. Transverse section of leaf . 160 



65. ,, ,, Epidermis of leaf, with stomata . 160 



66. Lepidodendron selaginoides. Transverse section showing the two 



steles of a bifurcating stem 162 



67. Ulodendron. Surface of branch . . . 166 



68. Lepidophloios scoticus. A. Bifurcating Halonial branch. B. 



Leaf-cushions enlarged ....... 169 



69. Lepidophloios fuliginosus. Transverse section of a young shoot . 171 



70. Lepidostrobus Hibbertianus. Compressed specimen of an almost 



perfect cone . . . . ... 174 



71. Lepidostrobus. Diagram of heterosporous cone in radial section 176 



72. Lepidostrobus Veltheiamianus. Transverse section of cone through 



microspore-region . jg. 



