302 FOSSIL FLORA OF THE 



Lepidodendron fusiforme (Tate). Plate XIII. fig. 3. 



Cicatrices distant, spirally arranged, fusiform, acuminate at both 

 ends ; cicatrule central, elliptical ; the spaces between the cicatrices 

 finely striated longitudinally. 



Localities. Alnwick Moor and banks of the Reed Water. The 

 specimen figured is in a fine-grained sandstone from the latter locality. 

 This species resembles the L. rimosum of Sternberg ; but it differs 

 from it in the form of the cicatrule, the striation of the surface, and 

 the distance of the cicatrices from each other. Brongniart considers 

 Sternberg's species as a decorticated Lepidodendron ; but our species 

 is more like an impression of an external surface. 



Lepidodendron oblongum (Tate). Plate XIII. fig. 2. 



Cicatrices spirally arranged, oblong, slightly tapering at each end. 



Localities. Alnwick Moor, Howick, Shilbottle. The specimens 

 of this species are all decorticated, and therefore the characters are 

 imperfect ; but as it not unfrequently occurs in the mountain lime- 

 stone series, and cannot be referred to any published, we have deemed 

 it useful to present a figure. 



Genus Ulodendron (Lindl.). 



The Ulodendron was the most singular plant which flourished 

 during the Carboniferous era. Specimens obtained from Alnwick 

 Moor enable us to add something to the knowledge of its form. Its 

 internal structure is the same as that of Lepidodendron ; it possessed 

 similar leaves and rhomboidal areolae on the stem and branches. A 

 specimen in Alnwick Castle shows that its mode of branching is di- 

 chotomose like the Lepidodendron ; but in addition, there are rows of 

 round or oval scars on opposite sides of the stem arranged verti- 

 cally; and these scars continue upward on the same plane along 

 the branches, while other rows commencing at the point of forking 

 run up on the opposite side of the branches ; the scars and the 

 branches are all in the same plane. These scars appear to have 

 been points of attachment of masses of inflorescence, which had con- 

 sisted of sessile cones formed of imbricated scales, in a manner similar 

 to a fir cone. The chief difference between Lepidodendron and Ulo- 

 dendron would therefore be, that the cones, bearing sporules or seed, 

 were placed at the end of branches on the former, but their position 

 on the latter was in linear rows on the stem and branches. 



Ulodendron ornatissimum (Sternberg's species). Ref. Brong. 

 Lepidodendron ornatissimum, t. 18. Buckland's Bridgewater 

 Treatise, Ulodendron Allani, t. 56. f. 3. 

 Locality. Alnwick Moor, in sandstone. 



The fruit-scars of this species are large and beautifully sculptured ; 

 we have them 1 1 inches in circumference ; the distance from each 

 other varies — in some specimens they are in contact, in others 1 inch 



