126 Mr. R. Kiclston on the Relationship 



1823. Allan. " Description of a Vegetable Impression 

 found in the Quarrj of Craigleith," Trans. Eoj. Soc. of Edin- 

 burgh, vol. ix. p. 235, pi. xiv. (Read Jan. 22, 1821.) — 

 The figure given bv Allan is a beautiful example of Lepido- 

 dendron Velthtimianum^ showing the large Ulodendroid scars. 

 This fossil is now in the Museum of Science and xlrt, Edin- 

 burgh, and is also the subject of pi. xviii. vol. ii. of Brongniart's 

 Hist. d. veget. foss. A reduced figure of the same specimen 

 is likewise given by Buckland in his ' Geology and Mine- 

 ralogy,' vol. ii. pi. Ixxvi. fig. 3; and, finally, Mr. Carruthers has 

 figured a single Ulodendroid scar from the same example in 

 the ' Monthly Microscopical Journal,' vol. iii. pi. xliv. fig. 4. 

 Allan regarded the large scars as the impressions of flowers 

 or fruit. 



1825. Konig. Icones fossilium sectiles. (London.) — There 

 is here figured on pi. xvi. fig. 194, without any description, a 

 specimen of Ulodendron which Konig names Lepidodendron 

 discophorum. Th^s seems similar to the plant subsequently 

 described as TJlodendrpn majus by Lindley and Hutton. 



1826. Sternberg. Essai d'un expose g^ognostico-bota- 

 nique de la flore du monde primitif, fasc. iv. p. xii. — Ulo- 

 dendron is here placed in the group '"'' Filices verce^^'' under the 

 name of Lepidodendron ornatissimum. Sternberg believed that 

 the large scars marked the attachment of fronds to the stem. 



1828. Bronguiart. Prodrome d'une histoire des vdg^taux 

 fossiles, p. 85. — Ulodendron is also included among the Lepi- 

 dodendra by Brongniart, by whom it is called Lepidodendron 

 ornatissimum, Sternberg. 



1831. Lindley and Hutton. Fossil Flora of Great Britain, 

 vol. i. pis. v., vi. — The name of Ulodendron was first applied 

 to these fossils by Lindley and Hutton, whose genus may be 

 defined as follows : — Stem covered with rhomboidal leaf- 

 scars, and bearing two opposite rows of large circular or oval 

 scars, indicating points from which " branches, or, more pro- 

 bably, masses of inflorescence," have fallen. 



Their genus Bothrodendron (Fossil Flora, vol. ii. pis. Ixxx., 

 Ixxxi.) is merely a decorticated condition of Ulodendron^ 

 notwithstanding that one of their descriptions is headed "Cor- 

 ticated" (to pi. Ixxx.) and the other "Decorticated" (to 

 pi. Ixxxi.), This point will be further remarked on. 



1837. Buckland. Geology and Mineralogy, vol. i. p. 475, 

 and vol. ii. pp. 92-95. — Buckland adopts the views expressed 

 by Lindley and Hutton, that the large circular or oval pits 

 were caused by the pressure of cones on the bark, which sub- 

 sequently grew up round their base. He also regarded the 

 genus Bothrodendron^ L. & H., as distinct from Ulodendron. 



