315 



Lepi 



to Z. sternhergii. — As for the small specimen ligured by H. D. 

 Rogers, Geology of Penn. 1858, p. 829, fig. 677, Lesquereux sees 

 no reason for not referring it to Lepidodendron chemungense. 

 Rogers says that it, with several fiicoids, chiefly characterizes 

 his Vergent flags {Portage^ Vilify) and being a confessedly 

 terrestrial plant, is interesting as forming one of a series of 

 steps through which we trace the gradual advent of that re- 

 markable flora which flourished in such exuberance in the later 

 Carboniferous or Coal period. 



Lepidodend/ron cheilaleu7n. See L. distans. XIII. 



Lepidodendron clypeatum. Lesq. Geol. Pa., 1858, Vol. 



2, p. 875, plate 15, f. 5, showing the surface of the bark, and 

 plate 16, fig. 7, showing the barked surface of the wood under- 

 neath. Common in the low anthracite coal beds at Carbon- 

 dale, Pa. — See three other figures 16, 17, 18, on plate 64, of 

 Coal Flora. P, 1880; page 380; Schimper makes it identical 

 with lepidophloios irregularis^ Lesq. and Lepidodendron les- 

 quereuxii (Andrews, Geol. Ohio, Pal. Vol. 2, pi. 53, f. 3); and 

 Lesquereux does not object; but objects to its being a variety 

 of Lep, olovatum^ or any European tree fern. It is common in 

 the Sub-conglomerate coal measures of Alabama ; and in the 

 Coal measures of Illinois. — XIII, 



