902 FLORAL ZONES OB^ THE POTTS VILLE FORMATION. 



Lepidodendron clypeatum Lx. 



To this species, which has been well illustrated b}' Prof essor Lesque- 

 reux/ I refer most of the specimens from the Sewanee zone in 

 Arkansas and Alabama hibeled in our collections as Lepidodendron 

 VeUJieimlamim Sternl), Some of its phases are onh' with difficulty 

 distinguished from the type descri})ed h\ Sternberg as Lepidodendron 

 R}ind<'tinunt^~ which, in turn, appears to be closely related to and often 

 confused with Lepidodendron ohovatuni of Sternljerg. The forms I 

 refer to Lepidodendr(m clypeatum have a wide distribution in the 

 Pottsville formation in the Southern Anthracite field, their range 

 being from the horizon of the roof shales of Lykens coal No. 4, or 

 possibly No. 5, to the level of Lvkens coals Nos. 2 and 8, from which 

 the specimens are specially abundant as well as typical. 



Lepidophyllum quixximoxtaxum sp. nov. 



This species of Lejndojyhyllurn constitutes one of the characteristic 

 t3"pes of the Mariopteris jyotUvillea zone throughout the Appalachian 

 region, although it rarel}" occurs in the horizons of the roof shales of 

 either the Pocahontas coal or the Lykens coal No. 5. The collections 

 from the Southern Anthracite field contain one or two specimens which 

 ma}' possibly have come from the shales of Lykens coals Nos. 2 and 3. 

 The species is especially characterized by the linear-lanceolate form 

 of the bracts, which are 5.5 to 8 cm. long and 10 to 13 mm. wide at 

 the widest point — some distance above the middle. The sporangi- 

 ophoros are cuneate and proportionately long, their length being 

 usually over one-fourth that of the blade, which is dilated and auricu- 

 late at the base, slightly contracted just above, and which tapers with 

 slightly convex borders from its wndest point, above the middle, to an 

 unusually narrow acuminate apex. The midrib is broad and strong 

 throughout, while the lamina is obscurely lincate longitudinally, the 

 lines slightly diverging toward the margin. The most important dif- 

 ferentiative features are the relative length of the base, the dilation 

 in the upper part of the blade, and the acute apex. The bracts are 

 much larger and generallv longer than those of Lepidophylluni canip- 

 iM'lJianxnn^ the sporangiophores of which are short, small, and gener- 

 ally rather broadly cuneate. So far as the distril)ution of these two 

 species has yet been observed in the Pottsville formation, it ai)pears 

 that L. eain2)heJlianKin is characteristic of the Sewanee zone and the 

 l^pper Intermediate division, while Z. quinnimo7itanuin is, in general, 

 almost exclusivelv confined to the Lower Lykens division. The latter 

 species is present in the roof shales of the Lykens coal No. 5 at the 



'Geol. Pennsylvania, Vol. II, Pt. II, p. 875, pi. xv, fig. 5, pi. xvi, fig. 7. Coal Flora, Atlas, p. VI, pi. 

 Ixiv, figs. 16 IGa (not figs. 17, 18) . 

 2SeeStur, rulm-Flora. Pt. II. p.2S3, pi. xxiii,flg. 1: pi. xxiv, fig. 1-3. 

 ^Lesquereiix, Coal Flora. Vol. Ill, p. 7s0, pi. cvii. fit;<. G, 7. 



