64 
The leaves are succulent, brittle, and veinless when 
fresh. . 
69. D. undulatum (R. Brown, Prodr. 332. L. no. 69. D. dis- 
color, Lindl. in Bot. Reg. 1841. t. 52); foliis ovato- 
oblongis emarginatis, racemis longissimis, sepalis peta- 
lisque undulatis, labelli trilobi lobis acutis intermedio 
lanceolato, lineis quinque elevatis intermediä apice 
fluxuosá.—— Java, Tropical New Holland.—— A species 
with singular dingy yellow-brown flowers, of little beauty. 
70? D. affine (Onychium affine, Decaisne herb. timor. 37); 
foliis lineari-oblongis acutiusculis coriaceis, pedunculo 
foliis triplo longiore oppositifolio? laxifloro, floribus 
spicatis; perianthio erecto, segmentis exterioribus lineari- 
lanceolatis acutis, interioribus subobovatis rotundatis 
mucronulatis ; labelli unguiculati lobis 3, medio lineari- 
lanceolato, lateralibus subrotundis.—— Timor.—-—Since 
M. Decaisne compares this with D. Mirbelianum, it pro- 
bably belongs to the present section. The petals are 
said to be obovate and mucronate. 
Next after these species must be placed those plants which 
Dr. Blume calls Pedilonum, of which one species only is 
known to me. In that I long since (Bot. Reg. 1839, misc. 
169) stated that the structure is of the following singular 
nature :— In the first place the lateral sepals and the base of 
the lip are so united into a spur, that their separate nature is 
entirely concealed towards the point of the spur. In the next 
place the rostellum is a deep two-lobed lip curved down over 
the stigmatic surface. The pollen-masses are in two pairs, 
and deep purple; and, which is extremely curious, they lie 
upon a loose hard transverse crustaceous gland, which seems 
to replace the gland and caudicula of Vandes, and which 
projects beyond the anterior edge of the anther, resting upon 
the two-lobed rostellum. The anther-bed itself is deeply 
excavated, and three-lobed, the anther adhering to the back 
lobe which is the narrowest. 
Should these characters, all or any of them, prove common 
to the plants now collected into this section, there will be no 
doubt about their forming a perfectly distinct genus. In the 
mean while I would not extend its definition beyond that of 
Dr. Blume. 
