234 DESCRIPTIVE CATALOGUE 



xylcm-parenchyma can all be well seen. Locally the 

 pitting of the medullary ray-cells is very conspicuous 

 and well preserved (text-fig. 66). 



V. 13194 c. Tangential longitudinal section of the above. This 

 shows well the height and frequency of the medullary 

 rays and also cuts across a small outgoing branch. 

 Lower Greensand ; Luccomb Chine, Isle of Wight. 



Found awl presented by Dr. M. C. Stopes, 1912. 



The following species does not come strictly within the 

 diagnosis of Podocarpo.vylon, but the curious pith suggests a 

 Podocarpoid affinity, which does not conflict with any of the 

 details preserved in the wood : 



[?] Podocarpoxylon Solmsi, sp. nov. 

 [Plate XXII ; text-figs. 67, 68, 09, 70.] 



Diagnosis. Coniferous wood of a branch more than 20 years 

 old, and 4 cm. in diameter, without normal resin-canals, and 

 with much resin-containing xylem-parenchyma. The most 

 characteristic feature is the pith. In this are three kinds of 

 cells: (a) Ground-tissue cells with slightly thickened walls, 

 squarish or oblong outline in longitudinal section, and with 

 granular contents; (b) much larger, thin-wailed, and nearly 

 empty cells ; (c) extremely thickened stone-cells. The stone- 

 cells and large specialised cells tend to form chains running 

 longitudinally among the ordinary cells, fairly regularly arranged 

 so that one large cell alternates with a couple of stone-cells. 

 Protoxylems in primary bundles, spiral, and scalariform. 

 Secondary tracheids up to 55 x 45 ^ in diameter, round bordered 

 pits principally in one row, the border about | the diameter of 

 the tracheid-wall in which it lies. Growth-rings well marked, 

 narrow zone of autumn wood, a few of the outer rings partly 

 " composite." Wood-parenchyma containing resin scattered all 

 through the wood-rings, cross-walls horizontal with very slight 

 constriction. Medullary rays all uniseriate, rather incon- 

 spicuous, principally low. Kay-cells uniform, walls thickened 

 but smooth, abietinean pitting apparently absent, end-\v;ills 



