FOSSIL COAL PLANTS. 33 



tuberculata, Lind. & Hutt, Tab. 180,) are not uncommon 

 in the coal mines of Northern Ohio, where they sometimes 

 exhibit the superior and inferior terminations, and with 

 considerable distinctness the details of the internal struc- 

 ture. 



The jointed striated stem, the verticillate arrangement 

 of the leaves and similar fructification have been considered 

 as proofs of the close affinity of Asterophyllites and Spheno- 

 phyllum, but the wedge shaped leaves of the latter genus 

 have been considered as quite distinctive. Since I have 

 found the two forms of leaves on the same plant, this 

 distinction will no longer serve, and many species of these 

 two genera must be united. 



ANNULARIA — STERNB. 



56. A. brevifolia, Brong., Prod., p. 156. 

 Zanesville. 



57. A. longifolia, Brong., Op. cit.,p. 156. 

 Asterophyllites equisetiformis, L. & H. 

 Bornia stellata, Sternb., Vers. 1, 4:,p. 28. 



Zanesville. 



SPHENOPHYLLUM — BRONG. 



58. S. Schlotheimii, Brong., Prod., p. 68. 



Palmacites verticillatus, Schloth., Flor. der Vor. Tah.'i. 



My specimens of this plant, which is abundant in the 

 upijer coal measures in Ohio and Pennsylvania, agree per- 

 fectly with the specific description given in Unger's Genera 

 ft Species, but not with Schlotheim's figure, which gives 

 the leaves an entire rounded extremity, nor Lindley and 

 Hutton's figure and description, which represents the num- 

 ber of leaves, in a verticil, as varying from six to nine. I 

 have seen no American specimen in which there were more 

 than six leaves in a whorl. Saline ville. 



59. S. erosum, L. & H. Foss. Flor. Tah. 13. 



I have found, apparently, this species terminating branches 



