184 



DESCRIPTIVE CATALOGUE 



there is a slight lateral constriction. Most of these cells con- 

 tain much blackened resinous remains. 



Medullary rays show up very clearly in transverse section 

 (text-fig. 51, m w.). The cross-walls lie at an angle or are 

 curved. The tangential diameter of the ray-cells is equal to or 

 rather less than the adjacent tracheids. The radial extent of 

 a cell equals 2 or 3 to 6 tracheids. In radial section the pitting 

 of the ray-cells shows up well, and consists of an irregular 



Text -fig. SS.Cupressinoxyloii /W ( V,,/,/>^/,XY', sp. nov. Tangential section 

 showing tracheids, tr. ; medullary ravs, m. ; and resin-containing wood- 

 parenchyma, rp., with rectangular cross-walls. No. 13195 c. 



number, from 1-5, of roundish pits. The commonest number 

 is 2 to 3 per tracheid-field (text-fig. 52, mp.). The outline of 

 these pits is a little irregular, and the size varies greatly, two 

 small ones and a large one, or rice versa, forming a group. 

 The rav-oell is vertically of about the same ?i/.e as the tracheids 



