Mr J. M. Macfarlane on LcindopJiloios. 183 



very remarkable double row of scars — completely absent 

 ill Lepidopliloios — clearly mark the two genera as being 

 distinct. But, as I shall shortly proceed to show, this emi- 

 nent palfeontologist has greatly advanced the line of re- 

 search in asserting that Halonia is part of Lepidopliloios. 

 Schimper refers his species teb^agonus to Lepidodendron 

 qitadrafum, but it seems to me exceedingly probable that it 

 is simply the second layer of the bark of Lepidophloios lari- 

 cinum, since it assumes the appearances these authors figure, 

 Schimper * refers all the forms of Lepidophloios to six 

 species. 



Williamson, t In an elaborate article "On the Internal 

 Structure of the Fossil Plants of the Coal IMeasures," 

 records observations made on material from the Petty cur 

 plant bed. He shows, by a comparison of the internal 

 structure of numerous specimens, that the genera Lomato- 

 phloios, Lepidophloios, Diploxylon, and Leptoxylon of 

 authors are identical. To his paper I shall have frequently 

 to refer. 



Stur J completely annihilates the genera Ulodendron 

 and Lepidophloios. The remarks whicii I have already 

 made regarding Ulodendron apply equally here, but Stur 

 destroys the last-named genus by supposing that it " is a 

 bulbil-bearing Lepidodendron stem," that is, he considers 

 that Lepidodendron at certain stages in its life-history 

 develops a series of viviparous bulbs, after the manner of 

 our recent Lycopodium Selago, and it is during this stage 

 that the Lepidophloios form results. Though the idea is 

 an ingenious one, in all my specimens I have not been able 

 to discover the least evidence in its favour, and the same 

 may be said of all other observers. Besides, there are 

 many otlier points which wholly forbid the union of 

 Lepidodendron and Lepidophloios, and one of the two 

 species which he figures Lepidodendron Veltheimicmum can 

 — as I hope to show on a future occasion — be traced 

 through all its morphological changes without the inter- 

 vention of any Lepidophloios stage. 



We shall regard Lepidophloios then as a Lycopodiaceous 



* Traitu de Paheontologie Vegetale, Paris, 1870 72. 



t Phil. Trans, part ii. 1872. 



J Die Culm Flora, Vienna, 1874. 



