LYCOPODIALES— LEPlDODENDREJi;— LEPIDODENDKON. 201 



Lepidodendron clypeatum Ls. 



1854. Lepidodendron clypeatum Lesquereux, Jour. Bost. Soc. ISTat. Hist., vol. vi, p. 429. 

 1858. Lepidodendron clypeatum Lesquereux, in H. D. Rogers: Geol. Pennsylvania., 



vol. ii, 2, p. 875, pi. xv, fig. 5; pi. xvi, fig. 7. 

 1879. Lepidodendron clypeatum Lesquereux, Coal Flora, Atlas, p. 12-, pi. ixiv, figs, 16, 



16 a-b (non figs. 17, 18); text, vol. ii (1880), p. 380. 

 1889. Lepidodendron chjjyeatiim Lx., Lesley, Diet. Foss. Pennsylvania., vol. i, p. 315, 



text flg. 

 1895. Lepidodendron clypeatum Lx., Dana, Man. Geol., 4th ed., p. 668, flg. 1034. 



The single specimen representing- a mold in sandstone, which I refer to 

 this species, is, by the characters of the bolster and the form of the A^ery 

 large leaf scar, nearer the fossils from the Boston mine, near Pittston, Penn- 

 sylvania, which were labeled by Professor Lesquereux under the above 

 name, than to any other Lepidodendron known to me. In fact, it differs from 

 the Pittston fossils only by the rather less acute lateral angles of the leaf 

 scars and the often higher position of the interior traces. The specimens 

 from the Boston mine are probably varietally different from the original 

 types figured in the Geology of Pennsylvania,^ in which the leaf scars are 

 proportionately much smaller. That type appears from the figure to be 

 closer to the specimens from Cannelton in western Pennsylvania, recorded 

 under this name, which are undoubtedly distinct from the form in hand. 



In his memoir on the plants from the Ayrshire coal fields, Mr. Kidston- 

 records Lepidodendron clypeatum Lx. in the synonymy of L. ohovatum Stb., 

 and, in addition, remarks on the specific identity of specimens, presumably 

 from Pittston, communicated to him by Mr. Lacoe. While I confess I 

 should hardly have identified the specimens from the Boston mine with the 

 European figures by which alone L. ohovatum is known to me, it is neces- 

 sary to note that our specimens from that mine are very different from the 

 American specimens referred b}^ Professor Lesquereux to the last-named 

 species. Compared with other material from this country, the form from 

 the Boston mine is most intimately related to a form in the upper part of, 

 and somewhat characteristic of, the Pottsville series, generally recorded in 

 our literature as L. Veltheimii Stb. It bears a close resemblance to the 

 L. Bhodeanum figured by Stur in the Ostrau-Waldeuburg Flora. 



Locality. — Four miles south of Clinton, Missouri, from a horizon about 

 60 feet above the Jordan coal. Collected by Dr. Britts. 



I Vol. ii, pt. 2, 1858, pi. xv, fig. 5. 



'^ On the fossil plants of the Kilmarnock, Galston, and Kilwinning coal tieltls, Ayrshire : Trans. 

 Koy. Soc. Edinb., vol. xxxvii, 2, 1893, No. 16, p. 336. 



