430 PALEONTOLOGY OF ILLINOIS. 



LEPIDODENDRON MORRISIANUM, Sp, nov. 



PI. xxn, fig. 1 and 2. 



THE cicatrices of this species are of three kinds. Under the 

 surface or true cortex, they appear slightly upraised, like those 

 of a Knorria, upon a short pedicel which is enlarged down- 

 wards, rough on the sides, with a flat rhomboidal top or 

 leaf scar, marked like that of the surface by three vascular 

 points, fig. la. The surface cicatrices are broadly rhom- 

 boidal, with the opposite sides nearly parallel, curved outside 

 and the leaf scar placed near the top, rhomboidal obtuse above 

 and below, acute on the sides and marked by three horizontal 

 large vascular points. The medial line of the bolsters is merely 

 indicated by two or three horizontal wrinkles, enlarged in the 

 middle. These cicatrices of the surface, when covered with 

 the base of the leaves and their coat of coaly matter, appear 

 hexangular, fig. 15. The leaves one foot lojg or irore, one 

 and a half line broad when flattened, are sharply marked by 

 three vascular lines and narrowly, regularly striate on their sur- 

 face, formed of a pellicle of coaly matter as thick as a leaf of 

 paper, fig. 2 enlarged. 



The tubular form of the leaves of some Lepidodendra is visibly marked in 

 this species, for it is only by considering them in that way, that we can account 

 for the difference remarked in the relative position of the vascular bundles 

 when the leaves are flattened, for they appear on our specimen either central 

 or lateral or single, double, triple, according to the plan in which leaves have 

 been compressed. This fine specimen from the roof shale of the coal of Morris 

 was communicated by Mr. J. Even. It now belongs to the State cabinet. 



LEPIDODENDRON MODULATUM, Lesqx. Geol. Rep. Penn., p. 874. 



PI. XV, fig. 1. 



In the shales at Morris, by Mr. S. S. Strong. It distinctly preserves its char- 

 acters, though the cicatrices are small. Found, also, in concretions at Mazon 

 creek. 



