542 Worsdell . — Observations on the Vascular 
divide each into two, and then into three, one or two passing 
towards the ventral side of the appendage so as to lie in the 
same plane with the bundle of the seminiferous scale, which 
has by this time divided into two. A very interesting fact to 
notice is that in the upper part of the seminiferous scale the 
bundles assume more or less of a concentric structure, and in 
the lower part of the appendage a concentric bundle appeared 
to arise quite independently of the other bundles, and ended 
blindly without fusing with those adjoining it ; this is of great 
interest, as similar concentric bundles, of independent origin 
and course, are found in the sporophylls of the Cycads. The 
bract or dorsal portion of the scale eventually possesses a 
system of three bundles, of which two exhibit transfusion-tissue 
and a little centripetal xylem, while the other is completely 
concentric in structure. The only difference between this 
plant and Sciadopitys , as regards the character of the bundle- 
system in the scale, lies in the fact that in the former the 
bundles of the appendage are chiefly formed by branching of 
the laterally-placed bundles, in the latter of the ventrally- 
placed ones. 
CUPRESSINEAE. 
Cupressus Lawsoniana , Andr. Murr. 
The bract and seminiferous scale are in this group so 
completely fused together that it is not easy to imagine each 
scale as in reality consisting of two, of which the tips only 
are free, that of the bract being reflexed (Fig. 21). 
Three bundles leave the central cylinder of the axis ; 
a median anterior one, and two from the lateral region of the 
cylinder and at a rather higher level than the first ; the 
median bundle supplies the bract (Fig. 22). 
Immediately on entering the double scale, one of the two 
lateral bundles (the orientation of which is at right angles 
to that of the bract-bundle) gives off a small branch which 
passes to the ventral side, assuming at the same time an 
