"2S6 C. A. SUSSMILCH AND T. W. E. DAVID. 



The inclusion of Lepidodendron in this flora is based on 

 the specimen mentioned above, and also on the late John 

 Mackenzie's record of the occurrence of Lepidodendron 

 ^associated with Otopteris ( = Aneimites). It has not been 

 determined specifically. 



The determination of the affinities of the species referred 

 to Rhacopteris is a subject which requires considerable 

 «tudy. R. incequilatera has been shown by Dun 1 to be 

 referable to Aneimites ovata (McCoy). Whether any of 

 the other species should be referred to this genus is a 

 question for consideration. On the other hand there is the 

 difficulty of defining the limits between Rhacopteris and 

 some types of Sphenopteris e.g. Eremopteris. 



Aneimites has been recorded from the Devonian of 

 -Canada and the Lower Pottsville of the United States. 

 Rhacopteris, as such, has been recorded from both Lower 

 and Middle Carboniferous (Culm and Coal Measures) of 

 Europe, although Seward 2 speaks of it as characteristic of 

 the Culm flora. 



As examples showing the difficulties in dealing with this 

 genus we may quote the following: — Aneimites pottsvill- 

 ensis D. White, from the Lower Pottsville Series is a 

 similar form to R. intermedia; Eremopteris Lincolniana 

 D. White from the Upper Lykens (Pottsville) is somewhat 

 similar to our Sphenopteris Clarkei, while Eremopteris 

 missouriensis Lesquereux is a similar type to some of our 

 JR. septentriomalis and also to R, Roemeri. 



Cardiopteris appears to be characteristic of Lower Car- 

 boniferous strata, but in Asia Minor at least it seems to 

 occur on a higher horizon, viz.: — the equivalent of the 

 lower part of the Westphalian. It must be remembered, 

 however, that the specimens of Cardiopteris from New 



1 Rec. Geol. Surv. N.S.W., vin, pt. 2, 1905, p. 157. 



2 Fossil Plants, n, 1910, p. 427. 



