404 FILICALES [CH. 



sperms. It is, however, immaterial whether they are dealt 

 with here or in the chapter devoted to the seed-bearing " ferns." 



Dactylotheca. 



Zeiller' created this genus for fertile fronds of Pecopteris 

 dentata Brongn. (= P.plumosa Artis''), a common British species 

 in the Upper and Middle Coal-Measures. Stur* included P. 

 dentata in his list of species of Senftenbergia, the genus to 

 which reference was made under the Schizaeaceae. 



Pecopteris (Dactylotheca) plumosa (Artis). Figs. 290, E, 292, 

 293. 



1825. Filicites plumosus, Artis, Antedil. Phyt. p. 17, PL xvii. 

 1828. Pecopteris plumosa, Brongniart, Hist. v^g. foss. p. 348, 

 Pis. cxxi. CXXII. 



— P. dentata, Brongniart, ibid. Pis. cxxiii. cxxiv. 



— P. delicatulus, Brongniart, ibid. PI. cxvi. fig. 6. 



1832. Sphenopteris caudata, Lindley and Hutton, Foss. Flor. Vol. I. 



PI. XLViii. ; Vol. II. PI. cxxxviii. 

 1834. Pecopteris serra, Lindley and Hutton, ibid. Vol. ii. PI. cvii. 

 1834. Schizopteris adnascens, Lindley and Hutton, ibid. Vol. i. 



Pis. c. CI. 

 1836. Aspidites caudatus, Goeppert, Syst. fil. foss. p. 363. 

 1838. Steffensia silesiaca, Presl, in Sternberg, Flor. Vorwelt, Vers. Ii. 



p. 122. 

 1869. Pecopteris silesiacus, Schimper, Trait, pal. v^g. Vol. i. p. 517. 



— Cyathocarpus dentatus, Weiss, Flora der jiingst. Stk. und 

 Roth. p. 86. 



1877. Senftenbergia plumosa, Stur, Culm Flora, ii. p. 187 (293). 



— S. dentata, ibid. 



1886. Dactylotheca plumosa, Kidston, Cat. Palaeozoic Plants, p. 128. 

 1888. Dactylotheca dentata, Zeiller, Flor. Valenc. Pis. xxvi. — xxviii. 



For a fuller synonymy reference should be made to Kidston's 

 account of this species*, from which the above list is compiled. 

 The large fronds of this species are tri- or quadripinnate. The 

 pinnules vary much in shape and size and in degree of lobing, 

 according to their position on the frond (fig. 293). The primary 



1 Zeiller (83) p. 184; (88) A. p. 30. ^ ^.rtis (25) A. 



3 Stur (75) A. 4 Kidston (96) p. 205. 



