186 



THE BOTANICAL MAGAZINE. 



[Vol. XXIV. No. 284. 



Text-fig. 1 . — Cryptomeriopsis 

 mesozoica, sp. nov. Longitudinal 

 section of a leafy twig, p, 

 pith ; x. p\ xylem and phloem 

 of the axis ; st, stone cell ; v, 

 vascular strand of the leaf; tt, 

 transfusion tissue; RC, central 

 large resin canal ; re, lateral 

 small resin canal ; /, fructifica- 

 tion of fungus (Pleosporites gen. 

 nov).;xlO. 



the autumn wood and 



Pith. Pith consists of parenchy- 

 matous thin walled cells and roun- 

 dish stone cells. In the pith of 

 the younger twig, small intercellular 

 spaces are found ; but in that of 

 the larger axis, the cells are packed 

 closely and leave no intercellular 

 spaces. We see frequently fungal 

 hyphae in the parenchymatous cells. 

 The structure of the pith closely 

 resembles that of Cryptomeriopsis 

 antiqua (Stopes and Fujii 11). 



Protoxyletn. The elements of the 

 protoxylem have spiral thickenings and 

 are placed innermost to the primary 

 xylem in a number of groups, so that 

 the wood is endarch. 



Secondary Wood. In this portion, 

 the absence of resin canals is one of 

 the characteristics. The annual rings 

 are not always to be made out dis- 

 tinctly. It is due to the two conditions, 

 firstly that the development of the 

 autumn wood is not enough pronounc- 

 ed, secondly that the development of 

 the "Rotholz" elements (Hartig 2) 

 begins in spring often immediately as 

 the continuation of the autumn wood 

 of the preceding year and gradually 

 passes into the summer wood. There 

 are two kinds of tracheids namely 

 thin walled and thick walled ones. In 

 transverse section the former are an- 

 gular, forming lighter coloured normal 

 spring and summer wood, and the 

 latter are roundish, forming chiefly 

 the " Rotholz." On the radial walls, 



