270 ON THE PLANTS OBSERVED DURING THE RORAIMA EXPEDITION. 
this plant grows both at the Kaieteur and on Roraima; but at the former station it 
apparently always grows floating in the water retained in the leaf-axils of the Brocchinia, 
while on Roraima it grows abundantly with its roots in the ground, and only very rarely 
in close association with the Brocchinia. The Roraima plant is, moreover, far more 
beautiful, its flowers are of a far more intense colour, than is the Kaieteur plant; this 
latter circumstance is possibly mostly due to the greater vigour which the plant displays 
when its roots are in the ground. I have already alluded to the occurrence of a very 
similar Utricularia on the Organ Mountains, associated with a huge Bromeliad, just as 
it is at the Kaieteur with the Brocchinia. | 
Next, the two other large-flowered species of Utricularia from Roraima claim notice, 
U. Campbelliana has already been described. It occurs abundantly, but apparently 
only on the forest-slope and for some distance from this up the cliff. 
The other species, U. montana, Jacq., ай. | Хо. 293], appears to occur only in crevices in 
the rocks on the summit. U. montana has been previously recorded from the West 
Indies, Colombia, and Peru. Тһе two species, though somewhat alike in general 
character, are, at a second glance, evidently very distinct. U. Campbelliana is altogether 
a more delicate plant; its leaves are much smaller, rounder, and its stems are shorter; 
its bladders are disk-shaped. The other species is altogether a stouter plant, with longer- 
stalked strap-shaped leaves and with spindle-shaped bladders. 
To one other set of plants I should here like to call attention. These are represented 
from among the plants collected during the Roraima expedition by two species of Epi- 
dendrum (Е. Schomburgkii, Lindley | No. 13], and Е. elongatum, Jacq. | Хо. 421). These 
seem to me to be plants, from the dry rocky ground of the interior of the country, which 
correspond more or less closely with three forms, in a fresh state evidently very distinct, 
but of which dried herbarium specimens have all been classed under the one name of 
Е. imatophyllum, and all three of which occur on trees near the coast. Of these coast- 
forms, the most distinct is one of constantly bifloral character, which occurs low down on 
trees overhanging the brackish water at the estuaries of the rivers; another, occurring on 
the tops of bushes slightly higher up the rivers, is, in general facies and in colour, very 
similar to the typical Ж. Schomburgkii; and the third, occurring in similar positions, but 
more sparingly, more nearly approaches in facies Е. elongatum, but is constantly of a 
peculiar scarlet colour. The two last-mentioned forms, unlike any of the others, are in- 
variably associated with ants, either because these creatures prefer to make their nests in 
the roots of the plants, or because the seeds of the plants find their most suitable nidus, 
and germinate, in the ants’ nests. 
_ [Norz.— The following determinations and descriptions of new plants were expressly drawn’ up for 
publication in the ‘ Transactions of the Linnean Society,’ a confidential copy being given to Mr. E. F. 
_ im Tham to help him in writing the foregoing Introduction. During the delay required to prepare the 
accompanying Plates, Mr. im Thurn has taken the unprecedented course of printing the whole of the 
unrevised draft, at Demerara, in ‘Timehri, the Journal of the Royal Agricultural and Commercial 
Society of British Guiana,’ vol. v. pp. 145-223 (Dec. 1886), thus forestalling the present publication.— 
oleo d. 8.|. 
