Cn. XXIV.] CONIFERS OF THE COAL PERIOD. 369 



Fig. 484. 



Fig. 434. Fragment of coniferous wood, Dadoxylon, 

 Endlicher, fractured longitudinally; from Coal- 

 brook Dale. W. C. "Williamson* 



a. Bark. 



b. "Woody zone or fibre (pleurenchyma). 



c. Medulla or pith. 



d. Cast of hollow pith, or " Sternbergia." 



Magnified portion of fig. 434; transverse section, 

 c. Pith. b, b. "Woody fibre. e, e. Medullary rays. 



In the above specimen the structure of the wood (b, figs. 484 and 

 485) is coniferous, and the fossil is referable to Endlicher's fossil genus 

 Dadoxylon. 



The fossil named Trigonocarpon (figs. 486 and 487), formerly supposed. 



Fig. 487. 



Fls 48G. 



Trigonocarpum. ovatum, Lindley & Hutton. 

 Peel Quarry, Lancashire. 



Trigonocarpum olivcB/orme, Lindley, 

 with its fleshy envelope. Felling 

 Colliery, Newcastle. 



to be the fruit of a palm, may now, according to Dr. Hooker, be referred, 

 like the Sternbergia, to the Coniferce. Its geological importance is great, 

 for so abundant is it in the Coal Measures, that in certain localities the 

 fruit of some species may be procured by the bushel ; nor is there any 

 oart of the formation where they do not occur, except the underclays and 



* Manchester Philos. Mem. vol. ix 1851. 

 24 



