430 
PALEONTOLOGY OF ILLINOIS. 
Lepidodendron Morrisianum, Sp, nov. 
PI. xxii, 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 
l£af'scAi\,,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 
liexangular, fig. 15. The leaves one foot long 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. 
