46 



PAL^ONTOLOGICAL BOTANY. 



Trevelyan counted 20 portions of these trees witliin the length 

 of half-a-mile, of which all but four or five were upright. 



Bronsfniart mentions similar 



erect stems as being found 

 near St. Etienne. The stem 

 of Sigillaria is fluted in a 

 longitudinal manner, like a 

 Doric column, and has a suc- 

 cession of single scars, which 

 indicate the points of inser- 

 tion of the leaves (Figs. 35, 

 36, and 37). When the 

 outer part of the stem sepa- 

 rates like bark, it is found that 

 the markings presented by 

 the inner surface differ from 

 those seen externally. This has sometimes given rise to 



Fiaf. 36. 



Fit?. 37. 



the erroneous multiplication of species and even of genera. 



proved by Mr. Binney. Fig. 35. Sigillaria 2')achydemia, after Lindley 

 and Hutton, from the shale of Killingworth Colliery, showing the 

 scars or places through which the vessels of the stem passed to the 

 leaves. Fig. 36. Sigillaria (Favularia) tessellata, from the Denbigh 

 coal-shale, showing the fluted stem with scars. Fig. 37. Sigillaria 

 pachyderma ; the stem marked with scars, and fluted longitudinally. 



