122 D. WHITE — A NEW TTENIOPTEROID PEEN A.ND ITS ALLIES. 



tion or restriction of those genera, while it has much also in common 

 with certain Triassic and Jurassic forms referred by various authors to 

 Angiopteridium, Angiopter'is, Marattia and Danseopsis. One or two of the 

 lowest pinnules found arc sublobate or crenulate on the lower side, as 

 though in the procsss of subdivision, such as I take to be the case in the 

 Danseites (Alethopteris") macrophylla figured by Newberry. 1 On the other 

 hand, the upper, sessile, confluent or decurrent pinnules (figure 2), 

 though springing from the central portion of the rachis (a condition indi- 

 cated in some species of Alethopteris), are equally distinctly alethopteroid, 

 being comparable to those pinnules seen in the upper part of primary 

 pinna; of various Alethopteridese, such as Alethopteris valida, Boul., 2 or in 

 the A. gigantea and A. longifolia of Achepohl, 3 both of which may be 

 allied with the group of long-pinnuled Paleozoic Danseites. It is prob- 

 ably generically inseparable from the Danseites (Alethopteris) macrophylla, 

 Newb. sp. 



But under the name Danseites we have two quite different groups of 

 plants. The genus Danmtes, as construed by Ettingshausen, Heer and 

 Schimper, 4 embracing those forms in which the pinnules, having the 

 characters of Tssniopteris, are rounded at the base and attached by the 

 midrib only, differs widely from the interpretation put upon Goeppert's 

 ambiguous genus by Stur 5 and Zeiller, 6 who, on account of the obscure 

 fruiting figured by Goeppert, 7 have denned it to contain a number of 

 pecopteroid forms with small pinnules and sori which, though not under- 

 stood in certain respects, are strongly analogous to those of the living 

 Dansea. The Dunn ilex ernersoni of Lesquereux, 8 referred to Goeppert's 

 genus by reason of the appearance of its obscure fruiting, 9 represents, 

 according to the figures, an alethopterid form related by habit and 

 venation to Gallipteridium, while the D. macrophylla, Newb*. sp., was not 

 placed by Lesquereux in Ta niopteris, to which it was considered referable 

 in size and nervation, because it was pinnate, the unequally cordate base 

 excluding it at the same time from Alethopteris. However, cordate or 



1. Oeol. Surv. Ohio, Pal. I, p. 383, pi. xlviii, tigs. :i, 3a. 



2. See Zeiller, Fl. foss. Valenciennes, p. 231, pi. xxxii, xxxiii, tig. l. 



3. Niederrh.-Westphal. St. 'ink., p. 78, pi. xxiv, tig. 12 3 p. 134, pi. xli, figs. 1, 1'. 



I. [n Zittel, Traite, ii y p. 85: "Feuille simple (ou double?), pen nee. Folioles inserees seulemeul 

 par la. nervure mediane, arroDdies :i la base, lineaires, devenant insensiblement pointues, poss6- 

 ilant les caraeteres des 'J'" niopteris, ;i bord entier : nervure moyenne ;is»7, forte, nervures lateral.es 

 se detaehant de alles-ci a angle droit, nombreuses, les unes simples, les autres bifurquees. Fructi- 

 fications disposers en deux series le long de la nervure m6diane." 



5. Carbon.-Fl. Schatzlarer Sch., p. 221, figs. -Y\a-c. 



0. Fl. foss. Valenciennes, p. 41. 



7. Systema, p. 380; Danceites asplenioides, p. 380, pi. xix, figs. -1, •">. 



8. Coal Flora, p. L57, pi. xxviii, tigs. l-:s. 



9. The Pecopteris asplenioides described by Fontaine anil 1. C. While (Permian Flora, p. 72, pi. 

 xxv, fig. I), from the Permo-Carboniferous, is perhaps closely related generieally, by its fruiting, to 

 D. ernersoni, Lesq. 



