612 Gluck . — The Species of Utricularia of Great Britain . 
summer and autumn in the specimens from continental Europe ; but I 
observed several times in the British specimens of U. intermedia } that 
in autumn, often before developing the winter bud, a long series of inter- 
mediate leaves is formed, which may occupy a length of 10-15 cm - °f the 
axis (PI. XLVII, Fig. 5). Such examples may show a great similarity to 
U. ochroleuca ; but on microscopic investigation they can be recognized 
as belonging to U. intermedia . The terminal segments of such leaves 
are acute, whilst the leaf-edges are denticulate (Text-fig. 2 d). The teeth 
are furnished with 2-8 small spines, which never occur on the typical water- 
leaves of U. ochroleuca ; besides this, small and isolated spines, otherwise 
existing only in U. intermedia , are directly set on the leaf-margin and are 
mostly mixed together with the little teeth. 
The subterranean shoots of U. ochroleuca are scarcely different from 
those of U. intermedia. These shoots may be up to 27 cm. in length, are 
sometimes not branched, and bear sometimes 1-3 lateral branches. The 
peculiar limb of the subterranean leaves is much reduced, and each leaf 
may bear 2-4 bladders. 
Besides this also the bladders of U. ochroleuca and U. intermedia are 
a little different, as von Liitzelburg has recorded. 2 In both the bladders and 
antennae are strongly curved, acute, and covered with hairs on the back. 
In U. intermedia many double hairs are attached to the valve, and also 
tufts of such hairs are in the angles of the valves ; in U. ochroleuca few 
double hairs are found on the valve, and the tufts of hairs in the angles are 
nearly missing. 
In the deeper water to about a depth of 100 cm. all vegetative parts 
as well as the leaves become longer and more tender (PI. XLVII, 
Figs. 3 and 4). The colourless and bladder-bearing shoots of such examples 
are often floating in the water, and show therefore many transitions into 
green and assimilating water-shoots (Fig. 4). Such examples I observed in 
different places (see the forms F, G, and H in the table on p. 613). 
U. ochroleuca under certain circumstances produces in dry stations 
land forms which are greatly reduced in all parts, and reach a length of 
only a few centimetres. I found this only in Germany 3 (see the form A in 
the table on p. 613). 
After having stated the difference of the vegetative region between 
U. ochroleuca and U. intermedia , I should like to draw the reader’s attention 
to the fact that U. ochroleuca by superficial investigation (viz. without 
1 Specimens of such a kind I found myself in pools between Recess Hotel and Recess Station in 
Ireland ; besides this Mr. W. H. Burrell (of Norwich) sent me recently specimens, quite similar, 
originating from Norfolk, which had been collected in the end of September and in the beginning 
of October. 
2 Compare Ph. von Liitzelburg, Beitragezur Kenntnis der Utricularien. Flora, 1909, pp. 63-66, 
and Figs. 46-48. 
3 Compare H. Gliick, Biologische und morphologische Untersuchungen, &c., vol. ii, pp. 64,65. 
