182 FLORA OF LOWER COAL MEASURES OF MISSOURL 



National Museum by a numlier of specimens from the vicinity of Clinton, 

 Missouri, labeled S. longifoliimi by Professor Lesquereux. This type, as 

 seen in PI. L, Fig. 5, closely resembles the leaves found on the robust 

 branches of S. emarginatiim, while, when dissected, the leaves are quite 

 suggestive of 8. bifurcatum. The nervation of this S2Decimen, studied hj 

 Lesquereux, is shown in the photographic enlargement, PI. LI. 



The presence of two undescribed species with very large leaves in the 

 Pocono and the Middle Pottsville gives to the large, wide-leafed group a 

 much greater antiquity than has been supposed. 



Localities. — Owen's coal bank, U. S. Nat. Mus., 6462, 5671, 5679, 

 5680; Deepwater, U. S. Nat. Mus., 5465; Pitcher's coal bank, U. S. Nat. 

 Mus., 5463; Gilkerson's Ford, U. S. Nat. Mus., 5461. 



SPHENOPHYLLUM LESCURIANUM II. sp. 



PI. L, Fig. 6b; PI. LI, Fig. h; PI. XXIV, 3c. 

 1897. S])henophyllum sp., D. White, Bull. Geol. Soc. Amer., vol. viii, p. 297. 



Stems slender, delicate, branching freely; internodes long in propor- 

 tion to the width of the axis, the ribs being narrow, distinct, and angular ; 

 nodes but slightly enlarged ; leaves six to the verticil, of equal length, the 

 middle pair nearly at a right angle to the stem, the upper and lower pairs 

 open and at equal angles to the stem, narrowly obcuneate, 3 to 5 mm. 

 long, 1 to 1.75 mm. wide near the top, of rather thin texture, very small 

 at the point of attachment, the latoral mai-gins slightly convex, generally 

 divided by a shallow angular or rounded sinus into two obtuse or obtuselj^ 

 pointed teeth, but sometimes, in the lower portions of the plant, divided 

 into three or four teeth of the same type; nervation consisting of one 

 slender nerve, simple to one-third or one-half the way up, then forking at 

 a moderate angle, each of the two branches entering a tooth, or, where 

 more than two teeth are present, one or both nerves forking again near the 

 top of the leaf ; fructification unknown. 



Among the specimens in the Lacoe collection labeled SphenojihyUum 

 angustifolimn Germ, by Professor Lesquereux, one example. No. 8711, from 

 the vicinity of Clinton, Missouri, is so different not only from all the 

 remaining specimens under that name, but also from the figures of foreign 

 specimens described as characteristic of that type, that I have felt con- 

 strained to exclude it from that species and place it under another name, 



