228 DESCRIPTIVE CATALOGUE 



V. 13191 b. Tangential longitudinal section of the above, partly 

 oblique to show rays in radial section ; both in the 

 rays and the tracheids the radial pitting can be well 

 seen. In this section a small branch and leaf-traces 

 can be seen coming off. 



V. 13191 C. Longitudinal section, partly obliquely radial and 

 partly tangential. Where it is truly tangential the 

 rays, and also the horizontal cross- walls of the resin- 

 parenchyma cells, can be well seen. 



V. 13191 d. Figured, PI. XXI, figs. 2 5- 3: and text fi-. 64. 

 Kadial longitudinal section, showing in various parts 

 the numerous low medullary rays, the pitting in their 

 radial walls and in their tracheid-walls ; also the 

 numerous resin-contuining x\ Inn-parenchyma cells. 

 The wavy outline of the tracheids and their groups 

 of adjacent pits can be seen in this .section and also in 

 V. 13191 6. 



Lower (Jreensaml ; Woburn Sands, Bedfordshire. 



/ \V. <i 



Podocarpoxylon Gothani, sp. nov. 

 [Text-figs. (5.") & 6().] 



Diagnosis. Species founded on a small decorticated branch, 

 2'5 cm. in diameter, with pith. Coniferous wood without resin - 

 canals and with a very small amount of resin-containing xvlem- 

 parenchyma, of which the principal feature is the pitting in the 

 radial walls of the medullary ray-cells, where very large, oval, 

 obliquely placed pits are placed one per tracheid-field. In 

 secondary wood the growth-rings are well-marked, very irre- 

 gular, a few partly composite. Tracheids rather variable, up to 

 about 40 p in diameter; bordered pits round, isolated, in one 

 row, nearly as large in diameter as the tracheid-walls in which 

 they lie. Medullary rays all uniseriate, principally from 6-9 

 tracheids distant, low, principally 2-4 cells high. Cells all 

 alike, walls smooth, thickened, but without abietinean pitting. 

 l\ay-pits large, oval, solitary or in pairs per tracheid-field, without 



