218 DESCKIPT1VE CATALOGUE 



from matrix, and shows something of the woody 

 texture, externally considerably frayed and worn 

 before petrifaction. Locally the preservation of the 

 details is extremely good and, the whole matrix being 

 darkly iron-stained, the cell-walls show up well in 

 section. 



V. 5451 a. Figured, PI. XX, fig. 1 ; and text-fig. 00. Tran>- 

 verse section showing several annual rings. The 

 tracheids, resin-containing xylem-parenehyma, and 

 medullary rays with their dark and granular contents, 

 are well preserved. 



V. 5451 b. Longitudinal tangential section, somewhat oblique. 

 In this direction this specimen is not so well pre- 

 served as the type, but all the essential details can be 

 made out. 



V. 5451 C. Longitudinal radial section; while apparently very 

 sharp and clear, it does not show the details ot' the 

 pitting so well as the typo, but the pits in the 

 tracheid and medullary ray walls can be made >ut 

 here and there. 



Lower (Jrcensand; Woburn iSands. 



Transferred from the. Botanical D<)>(., 1" 



V. 5431, V. 5431 ad. Figured, text-fig. (Y\ The external 

 view of this specimen is shown in text-fig. G3. The 

 diameter of the stem is about 4-~>x4 em., but though 

 the texture of the specimen is hard and close, there are 

 large gaps in the petrified tissue. 



V. 5431 a, b. Transverse sections of the above. The pith- cells 

 are partially represented, as is the primary wood, 

 but both are very poorly preserved. In the rings of 

 secondary wood, parts are well preserved and show the 

 wood-parenchyma very clearly. V. 5431 b is a second 

 and poorer transverse section of the same. 



V. 5431 C. Eadial longitudinal section of above. The pitting 

 of the elements can just be made out in a few places. 



