146 Transactions of the [E^^ST?^;. 



Finns. In their second volume they figured Bothrodendron punc- 

 tatum, and the additional materials before them satisfied them that 

 the cavities were the points of attachment of very large cones, which 

 consisted of rounded pohshed scales three-tenths of an inch thick, 

 attached to a central axis, and fitting accurately to each other. So 

 completely did they resemble " such a strobilus as that of Pinus 

 Lamhertiana, that," say the authors, " we cannot doubt that the 

 plant belonged to the natural order ConifenB." And to this 

 opinion they adhered at the close of their serial pubhcation, for in 

 the letter-press to plate ccxviii., which they considered the same as 

 B. pwidatum, they say they have nothing to add to what they had 

 already said. 



Buckland, in 1836, figured what he believed to be five species of 

 Uhdendron, referring them without hesitation to Conifers, and 

 holding that the scars were the impressions of deciduous cones. In 

 the centre of each scar there is a ca^aty indicating the place of 

 attachment of the cone. The upper portion is marked with furrows, 

 produced by pressure of the long radiating scales at the bottom of 

 the cone. This pressure nearly obhterated the smaller rhomboidal 

 scales of the bark in those parts where the furrows are deepest ; on 

 the lower portion of the scars the scales of the bark were but shghtly 

 modified by the pressure of the cones. The back scales under the 

 cone have fallen off, and the surface exhibits small apertm-es or 

 tubular cavities, through which vessels entered from beneath the 

 bark scales into the trunk. 



Presl, in 1838, in Sternberg's 'Flora' (p. 185), considered the 

 scars to represent the bases of branches, and referred the genera 

 Uhdendron and Megaj^hytum (which he thought scarcely deserved 

 to be retained as separate genera) to Lycopodiaee^. 



In his 'Prodrome' (1828), Brongniart, following Sternberg, 

 placed Rhode's plant in Lepidodendron, but in the fi'agment of 

 the second volume of his great ' Histoire des Veget. Fossiles' 

 (1837), he places the three genera included in the title of the 



EXPLANATION OF PLATE XLIV. 



Fig. 1. — Uhdendron ovale, sp. nov. Cicatrix of aerial root and leaf scars, natural 

 size. From a specimen from the Edinburgh Coal-field, in the British 

 Museum. 



„ 2. — U. transversum, Eichw. Cicatrix of aerial root, and markings of the 

 vascular bimdles to the leaves, one-half the natural size. From a 

 specimen from tlie South Wales Coal-field, in the Cardiff Museum. 



„ 3. — U. Stokesii, Buckl. Scar of the compact bundle in the centre of the 

 cicatrix of the aerial root. From a specimen from Halifax, in the 

 British Museum. 



„ 4. — U. parmatum, Carr. Cicatrix of tlie aerial root and leaf scars, natural 

 size. From a cast taken from the natural sandstone cast ; figured by 

 Allan, and found at Craigleith, Edinburgh ; now in the Museum of 

 the Royal Society of Edinburgh. 



