104 MESOZOIC FLORAS OF UNITED STATES. 



The plant occurs with an immense number of imprints at locahty 

 No. 7, where it stands next to the Ginkgos in number. It is found also 

 at localities Nos. 1, 4, 14, and 19. 



Pterophyllum minus Brongniart? 



PL XXI, Figs. 8, 9. 



1825. Pterophyllum minus Brongn.: Ann. Sci. Nat. Paris, Vol. IV, p. 219, pi. xii, 

 fig. 8.- 



Several specimens of a small plant that is much like the Pterophyllum 

 minus figured by Lindley and Hutton^ are found at locality No. 7. The 

 plant is somewhat smaller than the form figured in Fossil Flora, but is 

 of the same type. The leaflets are about 5 mm. long and 3 mm. wide. 

 They are closelj^ placed, touching by their edges. Thej^ are at right 

 angles to the midrib and of equal width from base to tip. The ends are 

 truncate or slightly rounded. The nerves are about 12 in number, single, 

 perpendicular to the midrib, and parallel to one another. They are slender 

 and can be seen onlj^ obscurely, even with a lens. The plant sometimes 

 approaches the wider forms of Pterophyllum Nathorsti. It may be a 

 Nilsonia, but a strong midrib is always shown. The amount of material 

 is too small and too poorly preserved to permit positive identification with 

 the plant of Lindley and Hutton. 



PI. XXI, Fig. 8 shows the specimen natural size and Fig. 9 the 

 upper part enlarged. 



"Professor Fontaine does not refer to this figure nor cite this memoir, and Mr. Seward also ignores it. 

 It is an obscure and httle-known paper, but important as being the one in which the genera Pterophyllum 

 and Nilsonia were first named. The plates of the early volumes of the Annales are difficult to find, being in 

 quarto form and usually bound up in atlases that cover several volumes of the te.xt. The}' are wanting in 

 many libraries and are generally overlooked by bibliographers. The plants were from the Rhetic of Hor in 

 Scania, but Lindley and Hutton identified a YoJrkshire Oolitic form with this species, and it is their figure 

 that Professor Fontaine refers to. Lindley and Hutton give the name Pterophyllum Nilsoni to another figure 

 on the same plate, identifying it with the Aspleniopieris Nilsoni ? figured by Phillips in his Geology of York- 

 shire, 1829, pi. viii, fig. 5, which in turn was supposed by him to be probably the plant so named by Stern- 

 berg in his Flora der Vorwelt, Vol. I (Tentamen, p. xxii, also index and index iconum), pi. xliii. figs. 3-5, 

 but which he first (fasc. IV, 1825, p. 40) called Asplenium Nitsonii. Mr. Seward, without mentioning these 

 early figures of Brongniart and Sternberg or their types, has used Sternberg's name (crediting it to Phillips) 

 and grouped a large number of forms under the combination " AnomozamUes Nilssoni (Phillips)." Pro- 

 fessor Fontaine, after receiving his Jurassic Flora of the Yorkshire Coast, and fully weighing the question, 

 declines to follow him in this, and prefers to retain the name Pterophyllum minus. — L. F. W. 



b Foss. Fl. Gt. Brit., Vol. I, pp. 191-192, pi. Ixvii, fig. 1. 



