THE FOSSIL FLORA OF THE YORKSHIRE COAL FIELD. 211 



silesiacus according to my specimen from Waldenburg. The enlargements given by 

 Goppert fully confirm the identity of his species with Dactylotheca plumosa. His figs. 

 2, 3, and 4 correspond to the plant given on my pi. iii. fig. 12, which is a common form 

 in Britain, intermediate in character between Filicites plumosus, Artis, and Sphenopteris 

 crenata, L. and H. The lower part of Goppert's example is quite typical, Sphenopteris 

 crenata, L. and H., and the upper part cannot be distinguished from Pec. plumosa, 

 Artis, sp. 



Again Goppert's figs. 6 and 7, especially his fig. 6, has a great similarity to the 

 Sphenopteris caudata, L. and H., which is seen in my pi. i. fig. 3. 



The fructification of Goppert's specimen has apparently been imperfectly preserved. 

 The only remark he makes about it is that the sori (Fruchthailfchen) are borne on the 

 middle of the straight lateral nerves. No description of the sporangia is given. 



Goppert's second specimen, given on pi. xxxix. fig. 1, is too indistinct for criticism. 



The Pecopteris silesiaca, Lebour. Illustrations of Fossil Plants, is the form named 

 Sphenopteris crenata, L. and H. } and is seen in my pi. iii. fig. 11, and in the lower 

 portion of fig. 13. 



The Aspidites Glockeri, Gopp.,* and var. falcatus, Gopp.,t may very possibly belong 

 to the Dactylotheca plumosa, and Schimper unites the type with Pecopteris silesiacus. \ 

 Whatever opinion may be held of the specific value of Goppert's original specimens of 

 Aspidites Glockeri, I cannot see how it is possible to regard the fern figured by 

 Ettingshausen as Pecopteris Glockeriana in his Steinkf. v. Radnitz., pi. xvii. fig. 1, as 

 other than Dactylotheca plumosa, Artis, sp. It is to be regretted that Ettingshausen 

 has not given any enlarged figures of the pinnule cutting and nervation of his specimen, 

 and the description he gives is partially adopted from Goppert. 



The Pecopteris angustiftda, Ettingshausen, given on pi. xvi. fig. 1 of the same work, 

 is evidently to be referred to Dactylotheca plumosa, and corresponds to the form shown 

 on my pi. i. fig. 1, but his specimen is apparently imperfectly preserved. 



Pecopteris (Dactylotheca) dentata, var. obscura, Zeiller. Bassin houil. et 

 perm, de Brive, p. 26, pi. ii. figs. 1-5, 1892. 



In describing this variety Zeiller says : The chief differences between this variety 

 and the type are that "the pinnules on the secondary middle pinnae are slightly con- 

 tracted at the base and more or less imbricated ; the anterior margin of each pinnule is 

 in part covered by the posterior margin of that which lies in front of it ; and further, 

 the medial nerve of each pinnule is clearly decurrent at the base, and the secondary 

 nerves are almost buried in the parenchyma and difficult to discern." 



"It is chiefly the two last mentioned characters — the decurrence of the medial 



* Syst. fil. foss., p. 375, pi. xxix. tigs. 1-2. 



+ Loc. cit., pi. xxix. figs. 3-4. 



J Traits d. paltfont. vege'L, vol. i. p. 518. 



VOL. XXXVIII. PART II. (NO. 5). 2 P 



