388 MR. HENRY RIDLEY ON ORCHIDEX AND 
On trees in mangrove swamps or dense jungle. Flowers 
white. Plants with lateral racemes often occur; and in some 
of these the callus is more two-lobed, and the lip slightly three- 
lobed; while in others the callus is quite entire and the lip 
rounded or even acute at the tip, so that the var. Wallichiana 
can hardly, I think, be kept up. 
The pollinia are very long and slender, tapering into the 
pedicel. Six are large and apparently fully developed; the 
other two (the inner ones in each fascicle) are much smaller and 
slenderer, and apparently abortive. The pedicel is short in 
comparison with the pollinia, and the disc lanceolate acute. 
APPENDICULA CALLOSA, Blume, Bijdr., p. 303. 
Hab. Singapore: Sambanang, Sungei Morai, Bukit Timah! 
Johore: Gunong Panti, alt. 1,000 feet! Kwala Kahan ! 
Kelsall. 
Malacca: Gunong Mering, Ophir range! 
Perak: Maxwell’s Hill! 
Penang: Government Hill, Curtis ! 
Pahang: Tahan River ! 
Sungei Ujong: Bukit Sula! N. Cantley. 
A very common plant in mangrove swamps or dense jungle, 
flowering all the year. The flowers appear one or two at a 
time ; they are pure white, except for the thick yellow callus on 
the lip, and the base of the lip, and violet-rose apices of the 
stelidia. The lip is parallel and adnate by its edges to the 
column for the greater part of its length, then abruptly bent 
just before the mid-lobe, at the bend between the raised lateral 
lobes, and passing on to the mid-lobe is a thickened yellow 
patch, which is the transverse appendage of the description 1n 
the ‘Flora of British India.’ It evidently corresponds to the 
epichiliary ridges and calli of other orchids and not to the 
basal callus (appendage) of Podochilus. I do not see that 1t 1s 
tubercled, as described. The mid-lobe is channelled in the 
centre. It is usually as broad or broader than the hypochilary 
portion. The mentum is full of nectar. Owing to the approxl- 
mation of the thickened disc between the two lateral lobes, the 
entrance to the mentum is very small. The anther is rather 
tall, with a blunt beak, and is partially divided in two by a 
couple of thin walls. The pollinia are eight, very thin and 
transparent, unequal and narrowly obliquely pyriform in out- 
