154 



LYCOPODIALES 



[CH. 



specimen bearing Halonia tubercles. The section represented 

 in fig. 172 is no doubt from an Halonia axis. In 1890 Cash 

 and Lomax^ stated that they had in their possession a stem of 

 the L. fuliginosum type with the external features of Lepi- 

 dophloios ; this identification has been confirmed by Kidston 

 and Weiss 3. It is, however, equally clear that certain species 

 with the elongated leaf-cushions of Lepidodendron must be 

 included among examples of shoots with the anatomical 

 chai'acters of L. fuliginosum. 



.n 



rsv- 





1 



Fig. 173. Lepidodendron ohovatum. (From a specimen lent by Dr D. H. Scott.) 



Dr Scott* published in 1906 a short account of the structure 

 of a specimen from the Lower Coal-Measures of Lancashire, the 

 external features of which were identified by Kidston with 

 those of Lepidodendron ohovatum Sternb. Dr Scott generously 

 alloAved me to have drawings made from his specimen ; these 

 are reproduced in fig. 173. The form of the leaf-cushion is by 

 no means perfect ; there is a well-marked median ridge, and 

 the small circular scar near the upper end of some of the 

 cushions may represent the ligular cavity. At the base of the 

 leaf-cushions a cortical meristem has produced a zone of 



' Cash and Lomax (90). 

 3 Weiss, F. E. (03) p. 218. 



2 Kidston (93) p. 547. 

 * Scott, D. H. (06^). 



