OF LOWEH GREEKS ATCD PLANTS. 201 



It, is petrified in a creamy silicified medium, which 

 preserves the tissues fairly well, but they were evi- 

 dently macerated and softened before petrifaction, 

 as the wood-cells are mostly a good deal crushed and 

 distorted. 



V. 5659 a. Text-fig. 58. The crushing of the tissues renders 

 much of this section obscure, but there are parts whore 

 the large square tracheids, the xylem-parenchyma, 

 and the medullary rays can be well seen. The U- 

 seriate rays are very well preserved in parts, and are 

 illustrated in text-fig. 58. The details of this wood 

 agree with those described for the type. 



V. 5659 b. lladial longitudinal section of the above. The 

 preservation is poor. 



V. 5659 C. Tangential longitudinal section of the above. While 

 the preservation is poor, the great height of the rays 

 and their partly biseriate nature can be seen (cf. 

 PI. XVIII, fig. 2). 



Lower Greensand ; Woburn Sands. 



Transferred from the Botanical Dept., 1898. 



Cupressinoxylon, sp. indct, 



V. 5450. A small branch of decorticated wood, 6 cm. long by 

 3x2 cm. in diameter, weathered at one end and 

 showing something of the woody texture. 



V. 5450 a. Transverse section of the above. The petrifaction 

 is very poor, the small tracheids with numerous resin- 

 canals are all that can be recognised. 



Lower Greensand ; Woburn Sands. 



Transferred from the Botanical Dept., 1898. 



Coniferous wood probably CUPRESSINOXYLON sp. 



52908. A decorticated branch showing its central axis and con- 

 centric annual rings, 3*5 cm. in diameter and 25 cm. 

 long. Externally it shows the woody texture, but is 



