150 



DESCRIPTIVE CATALOGUE 



The wood is regular in texture, the elements squarish and 

 large, adjacent elements often lying on the same tangent, so 

 that the rounding at the corners of the tracheids is very slight. 

 No normal resin-canals and no traumatic canals are present. 

 In transverse section, a few tracheal elements scattered through 

 the wood have blackened contents, which may bo the remains 

 of rcsiri. I have not been able to find any evidence of true 

 resi ti -parenchy ma. 



The iniiscrlate mfAullary rays are fairly numerous, principally 

 4-0 tracheids distrmt. in trnns\< <-tion tlu.'ir lanijriit ial 



Text-fig. 41. Cedroxyhm mtudstoiteiut,ip. nov. Transverse section of small 

 part of two annual rings, to show the very narrow thick-walled 

 autumn wood, a. ; s., spring wood ; in., medullary ray ; p.t., traoheid 

 adjacent to medullary ray showing several pits. No. 1769 a. 



measurement is rather less than that of the adjacent tracheids. 

 In height the rays are principally 1-3 cells high, but a few are 

 well over 20 cells high. The proportion is roughly ; 

 Kays of 1-3 cells high, 26 in number. 

 ,, between 4 and 10 cells high, 19 in number. 

 above 20 cells high, 4 in number. 



Among the rays a fair number show a slightly biseriate 

 character (text-fig. 42). These rays do not otherwise differ 

 from the imiseriate rays, and contain no resin-canals. 



