FOSSIL PLANTS. 



189 



serted upon rliomboidal areolse ; lower part of the stems 

 leafless ; areolae longer than broad, marked near their upper 

 part by a minute scar, which is broader than long, and has 

 three angles, of which the two latter are acute, the lower 

 obtuse, the latter sometimes wanting. 



Several species in the coal formation.* 



Iflodendron. Stem covered with rhomboid alareolse, which 

 are broader than long ; scars large, few, placed one above the 

 other, circular, composed of broad cuneate scales, radiating 

 from a common centre, and indicating the former presence of 

 organs, that were, perhaps, analogous to the cones of conifer ce. 



Two species in the coal measures. 



Lepidophyllum. This term signifies leaves, which it is 

 conjectured may have belonged to lepidodendron ; they are 



Cone. 



Magnified leaflet. 



FIG. 126. 



FIG. 127. 



sessile, simple, entire, lanceolate, or linear, traversed by a 

 single mid-rib, or by three parallel ribs. No veins. 



Lepidostrobus.Thia name indicates cones ovate, or cylin- 

 drical, composed of imbricated scales, inserted by a narrow 

 base around a woody axis ; their points sometimes dilated 

 and reversed in the form of rhomboidal disks. Seed solitary, 

 oblong, and winged, nearly as long as the scales. 



* Pict. Atlas, pi. iii., fig. 4 ; pi. xxvi., page 199. 



