112 MESOZOIC FLORAS OF UNITED STATES. 



PoDOZAMiTES LANCEOLATUS LATiFOLius (Friediicli Braun) Heer/' 

 PI. XXV, Figs. 5-7. 



1840. Zamites latifolius Fr. Br. non (Brongn.) Presl: Verzeichn. d. Kreis-Nat.- 



Samml. z. Bayreuth, p. 100 (nomen). 

 1847. Zamites distans latifolia Fr. Br.: Flora, Vol. XXX, p. 85 (nomen). 

 1867. Zamites distans latifolia Fr. Br. Schenk: Foss. Fl. d. Grenzsch., p. 162, pi. 



xxxvi, fig. 10. 

 1870. Podozamites distans latifolius (Fr. Br.) Schimp.: Pal. Veg., Vol. II, p. 159. 

 1876. Podozamites lanceolatus latifolius (Fr. Br.) Heer: Fl. Foss. Arct., Vol. IV, 

 Pt. II (Jura-Fl. Ostsibiriens), p. 109, pi. xxvi, figs. 5, 6, 8b, 8c. 



Three specimens of broad leaflets, not attached, that agree very 

 well with Heer's variety latifolius,'' were obtained, two from locality 

 No. 19, and one from locality No. 7. The leaf texture seems to have 

 been quite thick, so that the nerves are not visible. 



PI. XXV, Fig. 5, shows a nearly entire leaflet of medium size, of 

 which Fig. 6 is an enlargement. Fig. 7 gives two leaflets, one of the 

 largest and one of the smallest size. 



Podozamites ? pachynervis Fontaine n. sp. 



PI. XXV, Fig. 8. 



Fig. 8 gives a problematic form that may be a Zamites. It 

 occurs at locality No. 2 in the form of a fragment of a leaflet, with the 

 base and apex not preserved. As it narrows toward the base after the 

 fashion of Podozamites it may be placed provisionally in that genus. 

 The single specimen found does not suffice to fix its character. It is 

 noteworthy for the very strong nerves that stand out on the surface 

 like threads. They are about 10 in number, and diverge on entering 

 the wider portion of the leaflet near the base, and then become parallel. 

 They are unbranched. 



a I was probably in error in the first paper (p. 36) in including the Tsmiopteris latifolia of Brongniart from 

 the Oolite of Stonesfield, England, in the synonym}' of this species. Sternberg first referred it to Odontopteris, 

 and Presl to Zamites, as there stated; but no one seems to have followed Presl in this, and Brongniart in his 

 Tableau (1849) adheres to his original detei-mination and has been generally followed. There is no evidence 

 that Friedrich Braun had Brongniart's plant in mind in naming his Zamites latifolius (1840), which he made a 

 variety of Z. distans in 1847, the name adopted by Schenk when he reelaborated the Rhetic material in 1870. 

 Heer referred all the forms of Z. distans that he found in the Oolite of Siberia to Podozamites lanceolatus {Zamia 

 lanceolata L. & H.), using Schenk's varietal names in some cases, but not consistently. — L. F. W. 



6F1. Foss. Arct., Vol. IV,.Pt. 11, p. 109, pi. xxvi, figs. 5, 6, 8b, c. 



