LEAVES AND CONES IN VERTICAL ROWS. 475 
trunk and scars of some of these extraordi- 
iiary Coniferie. 
Among existing vegetables, there are only a 
few succulent plants which present a similar dis- 
position of leaves, one exactly above another in 
parallel rows ; but in the fossil Flora of the Coal 
2. Favularia. Stem furrowed. Scars of leaves small, square, 
as broad as the ridges of the stem. 
3- Megaphytou. Stem not furrowed, dotted. Scars of leaves 
very large, of a horse shoe figure, much narrower than the 
ridges. 
4. Bothrodendron. Stem not furrowed, covered with dots. 
Scars of cones, obliquely oval. 
Ulodendron. Stem not furrowed, covered with rhomboidal 
marks. Scars of cones circular. 
In the three first genera of this group, the scars appear to have 
S>ven origin to leaves ; in the two latter they indicate the inser- 
bon of large cones. 
In the genus Favularia (PI. 56, Fig. 7) the trunk was entirely 
'^'^vered with a mass of densely imbricated foliage, the bases of 
ne leaves are nearly square, and the rows of leaves separated by 
'nterinediate grooves ; whilst in Sigillaria the leaves were placed 
Ibore loosely, and at various intervals in various species. (Foss. 
Plora, PI. 73. 74. 75). 
In the genus Megaphyton the stem is not furrowed, and the 
®^f scars are very large, and resemble the form of horse shoes 
jl'sposed in two vertical iwvs, one on each side of the trunk. 
rk ’ 
ne minor impressions resembling horse shoes, in the middle of 
®se scars, appear to indicate the figure of the woody system of 
“n leafstalk. (Foss. Flora, PI. 116, 117.) 
In the genus Bothrodendron (Foss. Flora, PI. 80, 81) and 
'n genus Ulodendron, (Foss. Flora, PI. 5. 6.) the stems are 
*bnrked with deep oval or circular concavities, which appear 
have been made by the bases of large cones. These cavities 
be ranged in two vertical rows, on opposite sides of the trunk, 
nnd in some species are nearly five inches in diameter. (PI. 56. 
ngs. 3. 4_ g 
