74 



PAL^ONTOLOGICAL BOTANY. 



The ConiferaD of the present day are distinguished as 

 resinous trees or shrubs with punctated woody tissue (Figs. 



Fg. 61. 



Fisr. 65. 



Fi?. 62. 



Fig. 63. 



Fig. 64. 



62, 63, 64, 65), linear acerose or lanceolate parallel-veined 

 leaves, sometimes clustered, and having a membranous sheath 



Fig. 61. Araucaria excelsa, csiWed siiso Altingia or Eutassa ov Eutacta 

 excelsa, Norfolk Island Pine. 



Fig. 62. Woody tubes of fir, with single rows of discs. 



Fig. 63. AVoody tubes of fir, with double rows of discs, which are 

 opposite to each other. 



Fig. 64. Woody tubes of Araucaria excelsa, with double and triple 

 rows of discs, which are alternate. 



Fig. 65. Longitudinal section of the stem of a Gymnosperm, show- 

 ing tubes of wood marked with punctations in one or more rows, and 

 a medullary ray composed of cells running across the pleurenchyma. 



