GENEEAL EEMAEKS. 127 



flora than any other. We have 38 per cent, of the plants either identical 

 with or very nearly allied to Rhaetic fossils. Among these are many of the 

 plants most highly characteristic of the Rhsetic of Europe. Thus, we have 

 among the North Carolina plants the genus Palissya represented by P. 

 Braunii and P. diffusa, allied to P. conferta of the Lias of India. The genus 

 Palissya is considered as highly characteristic of the Rhaetic, and it is rep- 

 resented by still another species, P. Carolinensis. We have two Baieras, 

 one, the common Rhsetic form, B. Miinsteriana, and the other B. multifida, 

 having its nearest relation in B. toeniata, another Rhsetic plant. Macrotce- 

 niopteris gigantea is a characteristic form of the Rhsetic, and it is not clear 

 that it is distinct from M. magnifolia. Besides these, we may enumerate 

 such characteristic Rhsetic plants as Cheirolepis Miinsteri, Sagenopteris rhoi- 

 folia, Asplenites Bosserti, Laccopteris eleQans, Ctenophyllum Braunianum, both 

 varieties. The forms allied to Rhsetic plants are hardly less significant.. 



The genus Ctenophyllum is highly characteristic of the Rhsetic and Lias. 

 This genus seems to contain the most abundant cycads in North Carolina. 

 The genus Acrostichides is another which seems to be very characteristic of 

 the Rhsetic, and it is abundantly represented in North Carolina. We have 

 Acrostichides Egyptiacus very near to A. princeps ; A. linncecefolius near to 

 A. Goeppertianus ; and A. rhombifolius near to Cyclopteris pachyrachis. This 

 type of Acrostichides, with its pinnules, showing a tendency to assume a 

 rhomboid form for the sterile ones and a rounded form for the fertile ones, 

 seems to be very characteristic of the Rhsetic, for we can hardly doubt that 

 Cyclopteris (or Neuropteris) pachyrachis is an Acrostichides. The genus Lac- 

 copteris is very characteristic of the Rhsetic. It has, perhaps, three species in 

 the North Carolina flora. One, L. elegans, seems to be identical with the 

 European species; and two, L. Emmonsi and L. Carolinensis, are respect- 

 ively near to L. Miinsteri and L. elegans. I am, however, strongly inclined 

 to think that L. Carolinensis is L. elegans; and, if this be the case, then we 

 would have only two species of Laccopteris in this flora. The genus Cyca- 

 dites is characteristic of the Rhsetic, and more especially of the Jurassic. It 

 is here present with two species. The genus Podozamites is eminently a 

 Rhsetic and Jurassic type. The P. Emmonsi is more nearly allied to Oolitic 



