64 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



points, which correspond to the vascular bundles that enter the 

 bracts. Their appearance is very similar to the vascular scar on 

 decorticated stems. 



When the limb of the bi-act only is removed the exposed end 

 of the sporangia exhibits a roughly rhomboidal outline, somewhat 

 similar to that of the leaf-scar on the cushion. 



Many specimens of Lepidostrobi with more or less perfectly 

 preserved internal organisation have been described, and their 



internal structure is now fairly 

 well known. Fig. 10. 



The earliest Memoirs dealing 

 with the internal structure of 

 Lepidostrohus are by Sir Joseph 

 Hooker^ and Robert Brown." 

 In 1871 Binney published Part 

 II. of his " Observations on 

 the Structure of Fossil Plants 

 found in the Carboniferous 

 Strata," in which he deals 

 with " Lepidostrohus and some 

 Allied Cones." ^ Some of his figures show very clearly the 

 microsporangia occupying the upper part of the cone and the 

 macrosporangia the lower portion. Prof. Williamson also 

 describes a number of Lepidostrobi in his Memoirs.^ A valu- 

 able paper "On the Structure of the Axis of Lepidostrobus 

 Brownii, Scliimper," by Prof. Bower,' contains a careful descrip- 

 tion of the cone described by Robert Brown in 1847, but whose 

 paper was only published in 1851. 



More recently Mr. Arthur J. Maslen published a description 

 of some Lepidostrobi in the collection of the late Prof. Williamson, 

 now in the British Museum.^ On some of these he has detected 



Fig. 10.— Lepidostrobus — c, axis; b, 

 bract or sporophyll, bearing sporan- 

 gium ; d, containing macrospores ; 

 a, limb of bract. (Restored.) 



^ " Remarks on the Structure and Affinities of some Lepidostrobi." 

 Mtm. Geol. Surveij, Vol 11., Part ii.,^. UO. Plates. 184S. 



- "Some Account of an Undescribed Fossil Fruit," Trans, Linn. Soc, 

 London, Vol. XX., p. 469, Pis. XXIII. -XXIV. 1851. 



- Palatont. Soc, 1871, pp. 33-62, Pis. VII.-XII. 



♦ Phil. Trans., Memoir III., 1872; ibid., Mem. XIX., 1893. 

 6 Annali of Botany, Vol. VII., pp. 329-354, Pis. XVI.-XVII, 

 « Annals of Botany, Vol. XII., No. XLVL, 1898, p. 257. 



