THE FLORA OF THE COAL PERIOD IN THE UNITED STATES. 



345 



both in its linear lanceolate vascular scar, which is reduced to a mere median line ; the 

 cicatrices arc more elongated, narrower than those of L. undulatum, but very similar to 

 those of L. rimosum. When the bark is adherent the cicatrices appear only as distant 

 ridges, which are in reality scarcely more than the vascular scars — the remainder of the 

 cicatrix being hidden. 



I have seen but a single specimen, which is in the Museum of the Academy of Natural 

 Sciences. Whence it was obtained I am unable to state. 



L. GIGANTEUM, Lesq. 



L. ingene, Wood. Proc. A. N. S., New Series, vol. xii (1860), p. 239, pi. 6, Fig. 4. 



L. ACULEATUM, Sternb. 



L. mekiston, Wood. Proc. A. N. S., vol. xii, 1860, p. 239, pi. 5, Fig. 3. 



Ii. obovatum, Sternb. 



L. Bordac, Wood. Proc. A. N. S., New Series, vol. xii (1860), p. 239, pi. 6, Fig. 3. 



L. RUGOSUM, Sternb. 



L. Lcsquereuxii, Wood. Proc. A. N. S., vol. xii, 1860, p. 



Sigillaria perplexa, Wood. Proc. A. N. S., vol. xii, 1860, p. 237. This very odd 

 specimen, which from its apparently having ribs, I referred to the genus Sigillaria, is evi- 

 dently closely connected with the genus Lepidodcndron, for on removing the bark, I find 

 in one or two of the rectangular spaces the peculiar vascular markings of that genus. 

 Prof. Lcsquercux thinks it to be part of a young shoot of his L. vestitum. Is it possible 

 that the apparent ribs are the result of accident % I give a figure, so that if any one should 

 find a similar fossil he may know where to refer it to. 



L. vestitum, Lesq. 



L. rcctangulum, Wood. Proc. A. N. S., vol. xii, 1860, p. 519. 



L. SALEBrosum, Wood. Leaf-scar rhomboidal ; margin elevated, irregularly plicate, often 

 quite flexuous ; vascular scars triangular, placed in and filling up the apex of the leaf-scar ; 

 appendages apparent; internal dots and tubercles wanting; median line absent, but re- 

 placed by a strongly pronounced sub-central pit. 



This species is allied to L. vestitum, Lesq., but is distinct by the remarkable dot 

 vol. xiit. — 44 



