FLORA OF THE MESOZOIC PERIOD. 



75 



at the base (Fig. 66). Male flowers in deciduous catkins; 

 female flowers in cones (Figs. 67, 68). The seeds are con- 



Fig. 66. 



Fiir. 68. 



Fit?. 69. 



sidered by most botanists as being naked, ^. e, not contained 

 in a true pistil (Fig. 69). Some of the conifers have a succu- 

 lent cone, as the juniper (Fig. 70), and the yew (Figs. 71- 

 73) has a succulent mass covering a single naked seed (Fig. 

 73). The yew also has its pleurenchyma marked both with 

 punctations and spiral fibres. The arrangement of the punc- 

 tations in the Conifera? gives characters which enable us to 

 classify the woods into groups that have some relation to the 



Fig. Q6. Linear leaves of Pinus Strohus, Weymouth Pine, in a 

 cluster of five, with scaly sheath at the base. 



Fig. 67. Cone of Pinus sylvestris, Scotch Fir. 



Fig. 68. Cone of Ciqjressus semijervirens, common Cypress. 



Fig. 69. Scale, 5, of mature cone of Pinus sylvestris, with two naked 

 winged seeds, m m, at its base ; ch marks the chalaza, m the micropyle. 



