474 EXTINCT GENERA OF CONIFERjE. 
were Dicotyledonous plants, entirely distinct 
from Ferns, and different from any thing that 
occurs in the existing system of vegetation.* 
Favularia. 3Iegaphyton. Bothrodeiidron. 
Ulodendron.'\ 
The same group of fossil plants to which Lind- 
ley and Hutton have referred the genus Sigil- 
laria, contains four other extinct genera, all of 
which exhibit a similar disposition of scars ar' 
ranged in vertical roivs, and indicating the places 
at which leaves, or cones, were attached to the 
trunk. The names of these are Favularia, Me- 
gaphyton, Botlirodendron, Ulodendron.J Our 
figures PI. 56, Figs. 3, 4, 5, 6, represent portions of 
* “ There can be no donbt,” say they, (Foss. Flora, vol. i. p- 
1.5.5) that as far as external characters go, Sigillaria approached 
Fuphorbiee and Cacteae more nearly than any other plants now 
known, particularly in its soft texture, in its deeply channelled 
stems, and what is of more consequence in its scars, placed i>' 
perpendicular rows between the furrows. It is also well known 
that both these modem tribes, particularly the latter, arrive even 
now at great stature ; further, it is extremely probable, indeed 
almost certain, that Sigillaria was a dicotyledonous plant, for n® 
others at the present day have a true separable bark. Neverthe- 
less, in the total absence of all knowledge of the leaves and 
flowers of these ancient trees, we think it better to place the genus 
among other species, the affinity of which is at present doubtful-” 
t PI. 56, Figs. 3. 4. 5. 6. 7. 
X The genera composing this group are thus described, Foss- 
Flora, vol. ii. p. 96. 
1. Sigillaria. Stem furrowed. Scars of leaves small, round, 
much narrower than the ridges of the stem. 
