LEPIDOPHLOIOS, AND ON THE BRITISH SPECIES OF THE GENUS. 535 



From the above, it will be seen that Dawson uses the genus Lepidophloios in a very 

 different sense from that proposed by its author, and, in fact, includes in it plants which 

 are now known to belong to several well-defined genera, for Ulodendron, L. and H., 

 contained individuals referable in part to Lepidodendron and Sigillaria ; and Bothro- 

 dendron has been conclusively shown by Zeiller * to be an autonomous genus. 



In illustration of my remarks, it may be added that Dawson's Lepidophloios parvidusf 

 is Sigillaria (Ulodendron) discophora, Konig., sp., his Lepidophloios tetragonus\ is 

 probably only an older condition of the same species,§ and his Lepidophloios platystigma 

 is apparently Sigillaria Brardii,\\ Brongt. 



1869. Halonia, Roehl. Foss. Flora d. Steink Form. Westphalens, p. 139. 



Roehl favours the view that Halonia may form a separate genus of the 

 " Lepidodendrece." 



Lomatophloios. Ibid., p. 146. 

 Lepidophloios. Ibid., p. 149. 



Roehl also treats these two genera as distinct, figuring as representing the former two 

 Sternbergia piths. 



1871. Weiss. Foss. Flora d. jiingst. Stk. u. Rothl., pp. 150 and 215. 



Recognising that the leaf-cushions may be directed upwards or downwards, Weiss 

 unites Lomatophloios with Lepidophloios. He enters critically into the various aspects 

 of the question, and describes very minutely the structure of the " phyllodes," the leaf- 

 scar and its cicatricules. He accepts Corda's description of Lomatophloios crassicaule, 

 in which he ascribes to it a Sternbergian pith, and accepts the evidence afforded by the 

 occurrence alone of Sternbergia ( = Artisia) as a sufficient voucher for recording Lepido- 

 phloios crassicaide.^ 



1872. Schimper. Traite d. paleont. veget., vol. ii. 



Lomatophloios is here united with Lepidophloios (p. 49), while Halonia (p. 53) and 

 Cyclocladia, Goldenberg (not L. and H., p. 55), are treated as distinct genera. 



1872. Binney. " Observations on the Structure of Fossil Plants found in the Carboniferous 

 Strata," part iii., pp. 82-96, pis. xv.-xviii. (Palceontographical Society). 



Mr Binney describes the internal structure of several specimens of Halonia, which he 

 believes to be the Stigmarian root of Lepidodendron Harcourtii. Subsequent investi- 



* Bull. Soc. Ge'ol. de France, 3 e ser. vol. xiv. p. 168. 

 t Loc. cit., p. 490, fig. 170. g. 

 | Loc. cit., p. 490, fig. 170, d. 



§ See Kidston, Annals and Mag. Nat. Hist., 1885, vol. xvi. p. 255, pi. vii. fig. 13, a. 

 || Loc. cit, p. 490, fig. 170, e and/. 

 IT Loc. cit., p. 156. 



