Duc. 1906. ] AUSTRALIAN TUBEROUS DROSERAS. 237 
in water-logged sand, and it appeared as if the plants wanted 
to reach the clay that without doubt lay a short distance 
below, 
[ wish to get as many as possible of the species of Drosera 
examined to see in what relation the variations of bulb- 
formation stand to the character of leaf and flower, and I 
hope to have a larger number examined in the course of 
the imcoming spring, and then place at your disposal a more 
complete series of notes. In the meantime, these few notes, 
and specimens illustrating them, will furnish information 
that might otherwise reach you before very long at second 
hand. 
Note ON ABNORMALLY BRANCHED LEAVES OF HIPPURIS 
vuLGARIS, Linn. By H. F. Taae, F.L.S. (With figures.) 
Among some leafy stems of Hippuris vulgaris which were 
collected some years ago I find a number of specimens with 
leaves which differ from the narrow linear leaves with entire 
margins characteristic of the normal Hippuris vulgaris. 
In the abnormal specimens, while some are entire, many 
of the leaves in each whorl are provided with one or two or 
as many as four sharply-pointed tooth-like branches arranged 
pinnately on the leaf-margins. In some cases one margin 
only is branched, in others both margins are involved, and 
when this is so the branches are roughly opposite. A leaf 
with opposite branches is shown in fig. 1. When two 
branches occur on the same margin, the lower is, as a rule, 
the larger, and in some instances, as in fig. 2, the second 
branch is formed in the upper angle of the first. Other 
leaves on the abnormal plants are more or less bifurcate, and 
are provided with two distinct apices, figs. 3, 4, 5. 
These differences in form, as one would naturally expect, 
are accompanied by modifications in the leaf venation. The 
venation of the normal leaf is very simple. Only one strand 
of vascular tissue, the midrib, is at all conspicuous, and this 
runs direct to a very characteristic water-pore at the leaf- 
apex, ifs lateral ramifications being few and none of them 
extending quite to the leaf margin. 
Water-pores similar in structure to those of the normal 
TRANS. BOT, SOC, EDIN. VOL. XXIII. L7 
