FOSSIL COAL PLANTS. 



49 



Trunk mamillated, 

 sulci separating: ma- 

 mi llae, reticulated, (lis 

 tinct, mamillns con- 

 tiguous at the base, 

 haying the lorm o 

 hexagonal truncal ed 

 Ijyramids. Angles of 

 mamillce sharply de- 

 fined, and marked ^^^ai^lM^V ^5^* 

 with a fine salient ""B-ig. 2.-srBierceii. 

 line, with the exception of the two upper, which are a little 

 rounded and often want the salient line. Cicatrices hex- 

 agonal, angles well defined, two lateral most prominent. 

 Vascular impressions three, two exterior ovoid, central 

 transversely linear, slightly curved. Decorticated trunk, 

 mamillated, strongly striated longitudinally. Angles of 

 mamillpe more rounded than those of the exterior- Vacu- 

 lar impressions conspicuous. There is no described species 

 with which this is very likely to be confounded. Allied to 

 S. Brardii and S. Menardii^ Brong., it is far removed from 

 them by the size and geometrical regularity of its markings. 



For this beautiful species I am indebted to my friend L. 

 V. Bierce, Esq., of Akron, O., a gentleman who, in the 

 midst of arduous professional duties, is still a dilligent and 

 successful cultivator of science. 



Trunk ribbed, ribs about 

 f of an inch in width, prom- 

 inent, slightly rugose, al- 

 ternately expanded and 

 contracted. Leaf - scars 

 lenticular, rounded above 

 and below, lateral angles 

 acute. Vascular impres- 

 sions two in number, near- 

 ly round, separated by a [ 

 rounded tubercle. Decor 



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