62 THE OLDER MESOZOIC FLORA OF VIRGINIA. 



calls Tceniopteris glossopteroides. This plant, obtained from the locality at Los 

 Bronces, which yields so many species like our Virginia plants, differs from 

 both of the species of Pseudodanaeopsis, chiefly in the much greater size of 

 the pinnules. While the specimens figured may be parts of a simple frond, 

 there is nothing about them except their large size that would forbid the 

 idea that they are pinnules detached from a pinnate frond. The tapering 

 towards the base seen in fig. 2 a is due probably to the mode of laceration of 

 the plant. The rounded, rigid, prominent midrib, and the slender, frequently 

 anastomosing lateral nerves which go off under an acute angle and curve 

 outwards towards the margin of the pinnules, seem to indicate a plant allied 

 to P. reticulata. But the lateral nerves are more oblique than those of the 

 two Virginia species, and the branches keep more of a parallel course. At 

 the same time the anastomosing nerves are less numerous than in P. reticu- 

 late and more numerous than in P. nervosa. Hence it would appear prob- 

 able that we have here a plant uniting the characters of nervation of the 

 two Virginia species, with features peculiar to itself. The size of the pin- 

 nule to which the fragments belong would be no reason for refusing to 

 place Tanceopteris glossopteroides in the genus Pseudodanaeopsis, for the frag- 

 ments do not indicate a pinnule larger than, or indeed as large as the 

 pinnules of the magnificent specimen of Danceopsis marantacea, figured by 

 Schimper on plate xxxvii of his "Pal. Veg." 



Prof. E. Emmons, in his "American Geology," part vi, gives a descrip- 

 tion of a plant, fig. 89, which he calls Strangerites dbliquus. This is prob- 

 ably the same with Pseudodanozopsis nervosa. The undulating margin of this 

 plant, and its narrowing towards the base, seem to be due to the imperfect 

 preservation of the specimen. It does not show the anastomosis, it is true, of 

 the lateral nerves at the margin of the pinnule, since that part is removed in 

 the laceration of the plant. The size of the fragment, the straggling lateral 

 nerves, and the flatness of the midrib, all seem to show that it is very near 

 P. nervosa. Professor Emmons has evidently very imperfectly represented 

 the nerves, causing them to stop short in the lamina of the pinnule. If they 

 were continued in the direction held by them where they stop short they 

 would clearly anastomose near the margin. 



Formation and locality. — Pseudodanceopsis nervosa is a much rarer plant 



