216 ANATOMY OF THE GYMNOSPERMS 



4. CRYPTOMERIA, DON. PLATES 26 AND 27 



Transverse. Growth rings medium, with a dense summer wood and open 



spring wood. Resin passages wholly wanting. Resin cells prominent 



and scattering. 

 Radial. Rays wholly devoid of tracheids ; the cells sparingly, if at all, 



resinous; the terminal walls thin and not pitted or locally thickened. 



Bordered pits in i row, much less than the diameter of the tracheid. 

 Tangential. Fusiform rays wholly wanting. Cells of the i -seriate rays rather 



broad, round. 



1. C. japonica, Don. 

 Cryptomeria. Jap- = Sugi 



Transverse. Growth rings medium, rather uniform. The summer wood 

 prominent, about one fourth the spring wood into which it passes 

 rather abruptly, the structure dense. Spring wood very open, the 

 large tracheids hexagonal, uniformly thin-walled. Resin cells promi- 

 nent and scattering, chiefly confined to the summer wood and the 

 late spring wood, the resin filling the cells. Medullary rays some- 

 what prominent, distant 2-14, more rarely 20, rows of tracheids. 



Radial. Ray cells more or less contracted at the ends, equal to 5-9 spring 

 tracheids ; the upper and lower walls rather thick, uniform, distantly 

 pitted ; the terminal walls thin, not pitted or locally thickened, 

 straight or curved ; the lateral walls with round, obscurely bordered 

 pits, 1-2 in radial series or in the marginal cells 3-5 per tracheid. 

 Bordered pits one half the diameter of the tracheid, in i row, round, 

 the orifice round ; in the summer wood small, becoming obscure or 

 entirely wanting, the orifice a slit. Pits on the tangential walls of the 

 summer tracheids small but numerous. Resin cells upwards of 20 p. 

 wide and upwards of 400 //. long. 



Tangential. Rays all i -seriate, rarely 2-seriate in part ; low, the cells round, 

 rather thick-walled, uniform. 



5. PODOCARPUS, L'HER. PLATES 28 AND 29 



Transverse. Growth rings very variable, either very narrow or very broad. 

 Summer wood very thin and not clearly distinguishable from the 

 spring wood. Structure open, tracheids of the spring wood large, 

 squarish. Resin passages wholly wanting. Resin cells numerous, 

 scattering, rarely zonate. 



Radial. Ray tracheids wholly wanting. Bordered pits small, distant in 

 i row. Spiral tracheids wholly wanting. 



Tangential. Fusiform rays wholly wanting. Ray cells oval or round, 

 thick-walled. 



1. P. macrophylla, Don. 



Jap. = Maki 



Transverse. Growth rings very variable and narrow, or again broad. The 

 summer wood very thin and not very different, of 2-4 tracheids and 

 passing imperceptibly into the spring wood. Tracheids of the spring 



