88 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



those of most Lepidodendra, and much more slender than any- 

 known Sig Marian cone. 



The plant figured by Lindley and Hutton in their Fossil Flora, 

 Vol. I., PL XII., as Lepidodendron selaginoides, is a fine specimen 

 of Bothrodendron minutifolium, Boulay sp., and shows well the 

 characteristic leaf-scars. Their figure is most misleading, but the 

 type is fortunately preserved in the Hutton Collection, Newcastle- 

 on-T}me. Had it not been for the preservation of the type it 

 would not have been suspected that their plant was Bothrodendron. 



The other British species are Bothrodendron Wiikianum, 

 Kidston, 1 and Bothrodendron Kidstoni, Weiss. 2 They both occur 

 in the Calciferous Sandstone Series, and are extremely rare. 

 Only portions of the stems are known. 



Cyclostigma, Haughton, from the Upper Old Red of Kiltorkan, 

 must be placed in Bothrodendron. When Dr. Haughton 

 described Cyclostigma, the real characters of Bothrodendron were 

 not understood. On well-preserved specimens of Cyclostigma the 

 leaf-scars are seen to be oval or almost circular, and show slightly 

 above their centre three little cicatricules. The outer surface of 

 the bark between the leaf-scars is ornamented with cross-hatched 

 delicate longitudinal lines. The Geological Department of the 

 British Museum possesses specimens which show these characters 

 very clearly. The leaves are long, linear, single-nerved, and end 

 in a setaceous point. 3 



Weiss 4 includes Bothrodendron among the Sigillaria as a 

 sub-genus, and though some of its characters point to Sigillaria, 

 others militate against this position being given it. The leaf- 

 scars on the older stems agree in some respects with those of 

 Sigillaria in their form and arrangement, especially with the 

 Leiodermaria section, but the three punctiform cicatricules are 

 very exceptional in Sigillaria, while they are constant in Bothro- 

 dendron, and the leaf-scar on the young branches of Bothrodendron 

 minutifolium is surrounded by a "field" scarcely distinguishable 

 from Lepidodendron, though it is effaced at an early period. The 



1 See Annals and Mag. Nat. Hist, and Proc. Roy. Phys. Soc. already 

 mentioned. 



2 Die. Sigillarien d. Preuss. Steinhohltn, etc., p. 56, PI. XXVIII., fig. 110. 



3 Kidston, Catalogue of Palaeozoic Plants, p. 236. 1886. 

 i I.e., pp. 39 and 43. 



