376 MR. H. H. W. PEARSON ON SPECIES OF 
One was represented only by the type specimen, which it was 
important to disturb as little as possible; the other two 
possessed each one pitcher. The observations, an account of 
which follows, are therefore founded upon a strictly limited 
number of pitchers, and these not in the most favourable 
condition for investigation. 
The four species in which these double pitchers occur are: 
(1) Dischidia complex, Griffith (Malacca) ; (2) D. pectenoides, 
H. H. W. Pearson (Philippines); (3) an undescribed species 
represented by a single leafless and flowerless specimen collected 
at Kuching, Borneo (Haviland, 2015) *; and (4) a second un- 
described species of which there is only one equally imperfect 
specimen from Bangarmassing, Borneo (Motley, 525). 
The pitcher of D. Rafflesiana has been studied in detail from 
a morphological point of view by Treub ft, and anatomically by 
Scott and Sargant t. These and other authorities are in perfect 
agreement as to its morphology and, as is now well known, 
regard it as a modified leaf the apical growth of which is 
early arrested. A rapid growth of the central portion of the 
morphologically upper surface ensues, resulting in the formation 
of a hollow pitcher the inner surface of which is homologous 
with the lower surface of the leaf. The organic apex of the leat 
is at a point in the margin of the pitcher exactly opposite the 
insertion of the petiole. Additional evidence of the correctness 
of this view has recently been furnished by a plant in cultivation 
at Kew, which shows a series of transitions from the normal 
leaf to the pitcher §. 
That the descriptions which follow may be more intelligible, 
it may be stated at once that the pitchers which form the subject 
of this note are equally to be regarded as modified leaves. 
Their formation is no doubt similar to that described for 
D. Rafflesiana, but with certain modifications the nature of 
which will be discussed. 
* Mounted on the same sheet with this specimen are leafy branches which 
strongly resemble those of D. borneensis, Bece., which is not known to possess 
ascidia, TI believe that these are two distinct species under the same Collector's 
number. ° 
' Treub, M., Annales du Jardin Botanique de Buitenzorg, vol. iii. pp. 13-36. 
} Scott, D. H., and E. Sargant, Annals of Botany, vol. vii. pp. 243-269. 
§ Thiselton-Dyer, W. T., Annals of Botany, vol. xvi. pp. 365-369. 
