228 MKSOZOTC FLORAS OF rNITFD STATES. 



I'l. L.W. V\ii. 12 ,i!;iv(>s tlic <riT;itei'])()]1i()n of one of \\w lai'ger pinnules, 

 all that is preserved, and l'i<i. lo repre.'^Mits a fia.unienl of an ultimate 

 l)iniia. Tliis is the lar<iest fragment that was found. Fig. 14 shows the 

 .small fragment formerly referred with doui)t to Tliinnfehiia rariahiJix. 



This fossil is found at localities Xos. <J, 14, 18, 19, 20, and 22. It 

 is most abundant at locality No. 22. 



C'ladoi'Uleius rxcKUi (Duukfi) Ward n. comb." 



Pi. FXV, Figs. 15, 16. 



1846. Pecopteris Fngerl Dunk.: Monogr. d. Xorddeutsch. Wealdciil)ilduiig, p. 6, 



pi. ix, fig. 10. 

 1846. Pecopiens foliiinorphi Dunk, [iion Brongn.]: Op. tit., ]>. 6, ]>!. vii, fig. 5. 

 1869. Pecopteris Dunlrri Schimp. : Pal. Vcg., Vol. I, p. .539. 

 1877. Pecopteris exUiformis Geyler: Palaeontographica, Vol. XXIV, p. 226, \A. xxx, 



fig. 1. 

 1890. Aspidium Dunl'eri (Schimp.) Font.: Potomac Flora (Monogr. U. S. Gcol. 



Surv., Vol. XV), p. 101, pi. xxii, figs. 9, 9a, 9b; pi. xxv, figs. 11, 11a, 12; 



pi. xxvi, figs. 2, 2a, 8, 8a, 9, 9a, 18, 18a; pi. liv, figs. 3, 3a, 9, 9a. 

 1894. CladophleUs Dunl-eri (Schimp.) Sew.: Wealdeii Flora, Pt. I, p. KID, pi. vii, 



fig. 3, 

 1894. Aspidium Dunleri (Schimp.) Font.? Fontaine in Dillor & Stanton; Bull. 



Geol. Soc. Am., Vol. V, p. 450. (PI. LXV, Fig. 16.) 

 1895 [1896]. Aspidium Dunkeri (Schimp.) Font.1 Fontaine in Stanton: Bull. I'. S. 



Geol. Surv., No. 133, p. 15. (PI. LXV, Fig. 16.) 



Two small bits of a fern were found at locality No. 9 which can not 

 be distinguished from the plant named Pecopteris Dunkeri by Schimper. 

 This, from the finding on it, in the Lower Potomac of Virginia, of sori 

 like Aspidium,'' I regard as an Aspidium.' The California specimens 



o Schenk, who had seen Dunker's specimens says (Palaeontograpliica, Vol. XIX, p. 215) that he is unable to 

 distinguish his Pecopteris Ungeri from his P. polymorpha, and tieats them as .synonyms, as did Schimper (Pal. 

 Veg., Vol. Ill, p. 499) and as does also Mr. Seward (Wealden Flora, Ft. 1, p. 100). .\s the P. polymorpjia was 

 preoccupied by the well-known Carboniferous species so named by Brongniart in 1828, Schimper (Pal. Veg., 

 Vol. I, p. .539) renamed it P. Dunk-eri before .S<'henk had pointed out its identity with P. Ungeri. That specific 

 name must be restored to it, and a.s there is a pretty general agreement that it belongs to Cladophlebis the 

 above combination necessarily results. — L. F. W. 



«■ Monogr. U. S. Geol. .Surv., Vol. XV, pp. 101-102, pi. xxii, figs. 9, 9a. 



'Apropos of this Mr. Seward says (Wealden Flora, Pt, I, p. 102): " Fontaine's examples of A.yiitiiinji 

 Dunkeri undoubtedly belong to that species, but the fertile pinnule, pi. xxii, fig. 9a, on which apparently the 

 reference to .\spidium is based, seems hardly sufHeicnt evidence for assuming identity with the recent geinis." 

 If, however, this species is thus demonstrated to have the indusia of Dryopteris, that seems to establish the 

 reproductive characters of the genus Cladophlebis, hitherto unknown.— L. V. W. 



