6 14 Gluck. — The Species of Utricularia of Great Britain. 
microscope) may be easily mixed up with a form of U. minor. V. minor 
produces, like U. vulgaris , neglecta , and Bremii , a platyloba-form (Text-fig. 3). 
Probably it is a form which results from unfavourable nutrition; it dis- 
Text-fig. 3. An isolated leaf of Utricularia minor forma platyloba from Scotland. 
tinguishes itself from the type by enlarged leaf-segments as well as by 
reduced bladders. By the pointed end-segments this form approaches 
U. ochroleuca, , but by microscopic investigation it differences from U. ochro- 
leuca by the absence of the marginal and prickly denticles. I have seen myself 
U. minor f. platyloba in dried state from different Scotch localities. 1 
Flowering Stems. 
Evidently the flowering stems are very rarely developed in U. ochro- 
leuca. I have seen U. ochroleuca from about fifty stations in Great Britain ; 
amongst these are no more than two stations on which there are observed 
flowers. There is one in Scotland (Hillbog, near Garve) where flowers 
were very scarce, and the other in England (Morden Decoy), where the 
flowers were more copious. Also in the Black Forest I found U. ochro- 
leuca always barren. But evidently in Scotland the other species of 
Utricularia very seldom bear flowers. U. vulgaris , which is widely dis- 
tributed in Scotland, I have seen from about twenty-five stations (herbaceous 
material), and, in fact, only sterile. Mr. George West agrees with my own 
observation, as he says: ‘I have never seen any Utricularia flowering in a 
loch; they appear to be continually reproduced by hybernacula’ (l.c., p. 79). 
The cause that flowers appear so very scarce may partly be the con- 
1 For instance : Ardblair Loch (Rattray), Moss of Dalbruzeon (Glenshee), and Happlin Loch 
(Perthshire). Nat. Hist. Mus. of Perth. 
