238 NOTE ON BRANCHING OF HIPPURIS LEAF. [Szss. cxxi. 
leaf-apex are present on the apices of the bifurcations and ou 
the tips of the lateral branches of the abnormal leaves. 
Running out to these are prominent strands of vascular 
tissue. In the case of the leaves with lateral branches, the 
vascular strands are lateral and pass off from the midrib, 
while, where the leaves are bifurcate, two strands more 
prominent than others, and free from one another, run from 
the leaf-base, and pass out one into each branch of the 
bifurcation. 
SS Ak FIG. 3. FIG 4 
Abnormal Leaves of Hippuwris vulgaris, L. 
Fic. 1. Leaf with opposite lateral branches. Fic. 2. Leaf with two branclies 
on the same margin. Fic. 3. Leaf with forked apex. Fics. 3 and 4. 
Bifurcate leaves ; scl., sclerenchyma at leaf-base. x 4. 
At their point of origin at the leaf-base, the two strands 
are fused with a mass of sclerosed tissue (fig. 5, scl.) oceupy- 
ing the centre of the leaf-base in a position which, in the 
normal leaf, is filled by the thickened basal portion of the 
midrib. 
Believing that the material among which the abnormal 
specimens were found had been collected from a certain bed 
of Hippuris vulgaris growing in the Royal Botanic Garden, 
Edinburgh, I have, since the above notes were written, 
carefully examined these plants, and my search has been 
rewarded by the discovery of several plants growing there at 
the present time which exhibit teratological features similar 
to those described above. 
Mr. JAMES FRASER exhibited mounted specimens of the 
