sept. 1910] SUZUKI— ON THE STRUCTURE AND AFFINITIES 187 



the tracheids show usually one-rowed, roundish bordered pits, 

 but sometimes in the thick walled tracheids inclined simple 

 ones are found. 



The medullary rays are one cell broad and 1—7 cells in 

 height, but generally 1—4 cells. The walls of the ray cells are 

 thin and smooth. In radial section, the pit of the ray cell seems 

 to be narrowly bordered along its slit-like lenticular orifice and 

 its long axis inclines to the horizontal wall. There appear one 

 or two, rarely three of these pits per tracheid. 



The wood-parenchyma is sparingly distributed in the normal 

 wood. No traumatic resin canals appear in any relation to 

 wound-callus, but the formation of resin cells is seen in the 

 region of wounds. In this point the fossil differs from Abieteae 

 of Jeffrey (4), Sequoia gigantea and fossil Brachyphyllum 

 (Hollick and Jeffrey 3, Jeffrey 5) and rather resembles 

 plants of Cupressineas and Taxodiina? (except S. gigantea). 

 The cambium is well preserved in its normal position. 

 Secondary Phloem. Bast-fibres are arranged in a single 

 continuous layer interrupted only by the medullary rays (Phots. 

 4 and 5, PL VII), and many of such layers are repeated in 

 alternate zones with parenchymatous tissue just as in Taxo- 

 diinae and Cupressineas, though in the younger leafy twig, they 

 are not so regularly arranged. These parenchymatous zones 

 consist of only two layers of thin walled elements of equal 

 diameters which are regarded as the sieve-tubes (Phot. 5, 

 PI. VII). 



Thus in this fossil no phloem-parenchyma is found. I am 

 unaware of such a phloem structure anywhere else among 

 living and known fossil conifers. 



Cortex. In the secondary phloem of the fossil, there are 

 many large lysigenous lumens (Phot. 4, PI. VII). These lumens 

 are generally arranged in tangential rows in transverse sections 

 (Phot. 4, PI. VII). Sometimes the tissues between these lumens 

 are collasped or destroyed, and these lumens are then tangen- 

 tially continuous. Outside this region, roundish stone cells 

 occur here and there, and schizogenous resin canals are found in 

 this portion, but the epithelial layers are not so well preserved 



