348 



SEQUOIINEAE 



[CH. 



and a height of 30 ft. (fig. 764). The details are imperfectly pre- 

 served: a few of the tracheids show traces of single and double 

 rows of small bordered pits, but no pits are shown on the walls of 

 the medullary-ray cells. Resin-parenchyma is abundant and 



FIG. 764. Petrified tree in the Yellowstone National Park (Sequoia magnified 

 Knowlton). (From a photograph kindly supplied by Prof. Knowlton.) 



scattered as in Cupressinoxylon: it is doubtful whether the wood 

 of Sequoia can be distinguished from that of some other genera 

 included in the genus Cupressinoxylon. Specimens of wood from 

 the Tertiary coal-field of Aichi-Gifu in the middle region of Hondo, 



