15G MESOZOIC FLORAS OF UNITED STATES. 



1839. CheilantJiites denticulatus F. A. Roemer [non (Brongn.) Gopp.]: Verst. d. 



Norddeutsch. Oolitheii-Gebirges, Nachtrag,'p. 9, pi. xvii, fig. la. 

 1843. Confervites fissus Dunk.: Program d. hoheren Gewerbschule in Cassel, 1843- 



1844, p. 5. 

 1846. Confervites fissus Dunk.: Monogr. d. Norddeutscli. Wealdenbildung, p. 1, pi. i, 



fig. 1. _ 



1846. Sphenopteris Romeri Dunk.: Op. cit., p. 3, pi. i, figs. 3, 4, 4a, 5. 

 1846. Sphenopteris tenera Dunk.: Op. cit., p. 3, pi. Yiii, fig. 5. 

 1865. Microlepia Mantelli (Brongn.) Ett.: Farnkrauter der Jetztwelt, p. 216. 

 1867. Sphenopteris antipodum Tate: Quart. Journ. Geol. See. London, Vol. XXIII, 



p. 146, pi. vi, fig. 3. 

 1888. Aspidium Oerstedi Heer. Lesquereux: Proc. U. S. Nat. Mus., Vol. XI, p. 32 



in part, quoad Cat. U. S. Nat. Mus., No. 2434, Lesquereux's Nos. 913-915.« 

 1894. Onychiopsis Mantelli (Brongn.) Sew.: Wealden Flora, Pt. I, p. 41, figs. 4, 5 



on p. 50, fig. 6 on p. 52, pi. ii, fig. 1; pi. iii, figs. 1-4. 



Four specimens of a fern with very slender incisions are found in 

 the collections of Woolfe and Dumars. Three of them are in Mr. Woolfe's 

 collection. These were identified by Professor Lesquereux with Aspidium 

 Oerstedi Heer. Lesquereux must have given this collection a very hasty 

 examination, for this plant has not the slightest resemblance to A. 

 Oerstedi. The three specimens collected by Mr. Woolfe appear to belong 

 to the upper part of the compound pinna or frond. One of them is given 

 in PI. XXXIX, Fig. 5. Fig. 6 represents a magnified ultimate pinna of 

 the same in which the pinnules are reduced to lobes. The fossil collected 

 by Mr. Dumars apparently belongs to a lower portion than these. This 

 is given in PI. XXXIX, Fig. 3, and Fig. 4 represents, magnified, a portion 

 in which the lobes have become pinnules. This form is a fragment of a 

 compound pinna, or of the frond, which toward its termination passes 

 into the form given in Fig. 5. These specimens show that the plant has 

 the following character: 



The ultimate pinnse make an acute angle with the penultimate 

 rachis, which is apparently winged by a decurrence of the lowest pinnules. 

 They are narrowly oblong and have linear, almost threadlike, acute 

 pinnules, which are set on very obliquely and united at base, so as to 

 make the rachis of the ultimate pinna winged. They diminish in size 



« Unfortunately all the specimens referred by Professor Lesquereux to the same species were given the same 

 number in the catalogue of the United States National Museum, and as Professor Fontaine refers the speci- 

 mens to different species there would he no way of indicating his determinations had not Lesquereux attached 

 to each imprint a private number of his own. I am therefore obliged to quote his private numbers in addition 

 to the Museum number. — L. F. W. 



