OF LOWER GEKENSAND PLANTS. 



115) 



Resin-canals are very numerous and conspicuous, and lie in 

 rows forming tangential bands in the autumn wood (PI. VIII, 

 figs. 1, 2, & text-fig. 28). I have not observed any single 

 isolated canals, or any in the spring wood except those which 

 cross it transversely, running horizontally in the medullary 

 rays. The canals appear to be normal ; there is no evidence of 

 wounding, and they lie in these alternating tangential bands 

 throughout the wood. Individually the resin-canals are large, 



Text-fig. 29. Pityoxt/fan Woodwardi, sp. nov. Radial section showing tlie 

 medullary ray-cells and their pitting, p.m., pitted cells, with a single, 

 large, oval pit per traclieid. rt., ray-tracheids with small, round, 

 bordered pits. No. V. 54296. 



2-*3 mm. in diameter. The epithelium lining them appears 

 to be thin-walled, but is rather obscured by the blackened con- 

 tents which line the cavity. The parenchyma immediately 

 adjacent to them consists of short squarish cells, with rectangular 

 end-walls. I have not observed tyloses. Adjacent canals are 

 often separated only by a medullary ray. Connecting these 

 vertically running canals are remarkably conspicuous transverse 

 canals which run in the wide medullary rays. 



