CARBONIFEROUS LYCOPODS AND SPHENOPHYLLS. 61 



doubt that it is the Lepidodendron Veltheimianum, as suggested 

 by Sir William Dawson. Lepidodendron Veltheimianum is very 

 common in the horizon in which the Pettycur material occurs. 



But, further, the very characteristic macrospores of Lepidoden- 

 dron brevifolium, Will, (not Ett.), with the long hirsute 

 appendages, are the Lagenicida I. described by Mr. J. Bennie 

 and myself from several localities in the Calciferous Sandstone 

 Series where Lepidodendron Veltheimianum is plentiful. 1 



V. Lepidostrobus, Brongniart, 1828. 

 1828. Lepidostrobus, Brongniart. Prodrome, p. 87. 

 1865. Flemingites, Carruthers. Geol. Mag., Vol. II., No. xvi. 



Cylindrical, ovoid, or oblong cones, composed of a ligneous axis, 

 to which are attached the single-nerved bracts or sporophylls in 

 steep spirals. The bracts consist of two parts, a basal portion or 

 pedicel springing from the axis almost at a right angle, and on 

 which is placed the single sporangium, and a limb which extends 

 upwards from the extremity of the pedicel and forms with it at 

 their point of union an acute angle. The lower bracts bear the 

 macrosporangia, the upper the microsporangia. Macrospores 

 larger, smooth or apiculate, and provided with a triradiate ridge. 

 Microspores very small, tetrahedral. 



Internal Organization. — The axis consists of a central bundle 

 surrounding a pith of delicate parenchyma. The vascular 

 elements are composed of scalariform tracheides, the smaller 

 members being placed on the outer edge, and are the first-formed 

 tracheides of the bundle. The vascular ring of the cone axis 

 corresponds to the primary xylem of the stem, and, like it, is 

 developed centripetally. 2 



From the small outer tracheides spring the bundles which go 

 to the bracts. * 



1 Proc. Eoy. Phys. Soc. Edin., Vol. IX., PI. VI. , figs. 20a to 20s. 

 1886. "On the Occurrence of Spores in the Carboniferous Formation of 

 Scotland." 



2 For a detailed account of the structure of Lepidostrobus, see Maslen, 

 Trans. Linn. Soc. London, 2nd Ser. Bot.. Vol. V., Part xi., p. 337 



