FOSSIL PLANTS. 451 



They form an intermediate genus which, difficult to limit as it 

 is now, will become separated when our American species 

 have been more fully collected and studied. 



Sigillaria Brardii, Brgt. Hist, des Veg. Foss., 1, p. 431, tab. 

 158, fig. 4. Colchester and Duquoin. 



Sigillaria tessellata, Brgt. Hist, des Veg. Foss., l Jv p. 436, tab. 

 157, fig. 1, and tab. 162, fig. 1-4. Found at Colchester. 



Sigillaria intermedia, Brgt. Hist, des Veg. Foss., 1, p. 474, 

 tab. 165, fig. 1. The State Cabinet has two specimens, from 

 Carmi, White county. Upper Coal Measures. 



Sigillaria Yardleyi, Lsqx. Cat. of Foss., pi. — , p. IT, tab. 2, 

 fig. 4. Locality: Big Yermilion river. 



Sigillaria reniformis, Brgt. Hist, des Veg. Foss., 1, p. 470, 

 tab. 142. A common species. The specimen in the State 

 Cabinet is without indication of locality. 



Genus Syrigodendron, Brgt. Stems furrowed; ribs equal, 

 parallel, narrow, convex, bearing on the corticated surface of 

 the ribs, small, round or curved mammillae, without any vascu- 

 lar scars. 



Syrigodendron pachyderma, Brgt. Hist, des Veg. Foss., 1, p. 

 479, tab. 66, fig, 1. A specimen in the State Cabinet without 

 indication of locality. 



Genus Lepidodendron - , Sternb. Stems of various size, some- 

 times very large and long, with a dichotomous ramification or 

 forking in ascending ; and bearing linear, grass-like leaves on 

 the young branches ; surface of the stem marked by the im- 

 pressions or cicatrices left at the base of the leaves, or at their 

 point of attachment ; cicatrices rhomboidal or oval, acute at 

 both ends, sometimes deltoid, marked in the middle or in the 

 upper part by triangular or rhomboidal vascular scars. These 

 are ordinarily marked in the middle by three points ; some- 

 times they have, descending from both the angular sides, two 



