PRB-OARBONIFEROUS PLANTS. 



88 



■J w\ s i.. Roots of AsTEuopuYLLiTBiB, &o. 



34. PlNNULARIA DI8PALANS, Dn.— (PI. VII, Figs. 74 to 76.)— J. G. S., 

 XVIII, 812 ; PI. XIII, Fig. 22.— M.D. , St. John, Now Brunswick. 



" Smooth slender stems, producing nearly at right angles long branchlets, 

 some of which produce secondary branchlets in a pinnate manner. 

 Stem and branches having a slender vascular axis." ' Y'v ' * • 



Specimens in Prof. Hartt's collection shew delicate longitudinal stria- 

 tion, also areoles from which branchlets or rootlets have been broken off. 

 They also show well the manner of the ramification of the central axis into 

 the branches. I have no doubt that this Pinnularia was a cylindrical branch- 

 ing root, probaldy of Asterophyllites, S'phenophi/llum or CalamiteSy with 

 a slender vascular axis aurrounded with a thick cellular coating. The two 

 following species arc distinct from the present, but probably also roots. 



85. Pinnularia elongata. S. N.— (PL VII, Fig. 77.)— M.D., St. John, 

 New Brunswick. 



Stem slender, striate, branches few, long and slender, given off at an 

 angle of about 75". 



86. Pinnularia nodosa. S. N.— (PI. VII, Fig. 78.)— M.D., St. John, 

 New Brunswick. 



Stem straight, with alternate branches at right angles. The branches 

 expand at intervals into obscure lobes. 



This species is found in the same beds with Oalamites and Asterophylr 

 lites scutigera. It was probably a root furnished with tuberous expan- 

 sions, which are, however, very obscure. 



(^Lycopodiaceoe.) 



Genus Lepidodendron — Sternb. "^ . '.^ 



37. Lrpidodendron Gaspiandm, Dawson.— (PI. VIII, Figs. 82 to 84.) 

 —J. G. S.,XV, 483 ; Fig. 3. lb. XVIII, 313 ; PI. XIV & XVH. 

 — M.D., Gaspd. M. & U.D., New York. M.D., St. John. 



Afeoles contigxious, elliptic, with central leaf-scar ; leaves thick at base, adcular, 

 slightly ascending and curving downwards, short? Strobiles small, 

 lateral? Branches slender, straight and very uniform in thickness. 

 Areoles prominent in decorticated sterna. 



My explorations of last summer prove this widely distributed Devonian 

 plant to be rare in the Gasp^ sandstones. Only a few drifted specimens 









