234 ORCHIDS OF THE SIKKIM-HIMALAYA. 
All the specimens hitherto obtained of this have been found growing on the nodes 
of the stems of bamboos, their roots twining amongst the decaying bracts and scales 
found in these situations. No plants have ever been found growing on the internodes. 
The scale or plate proceeding from the back wall of the spur in this species is flattened, 
and somewhat resembles a septum. The plant, however, is, as we now believe, a true 
Cleisostoma, and we therefore transfer it from Sarcanthus in which genus we originally 
placed it. | 
Ртлте 310.—Cleisostoma bambusarum, King and Pantling. A plant growing on the node of a living 
bamboo, of natural sise. Fig. 1 sepals and petals separated, 2 а flower, 3 side view of bract, ovary, 
column and lip, 4 section of the foregoing, 5 front view of the end of the spur, 6 profile view of anther, 
7 pollinia—al? enlarged; 8 transverse section of a leaf; of natural sise. 
6. CLEISOSTOMA MICRANTHUM, King апа Pantling. 
Stem stout, compressed, 3 to 8 in. long, covered by leaf-sheaths. Leaves narrowly 
oblong, keeled, obliquely truncate and slightly bifid, the base shortly sheathed; length 
2:5 to 85 in., breadth :5 to ‘6 in. Racemes leaf-opposed, longer than the leaves, the 
peduncle and rachis stout. Flowers numerous, but only а few expanding at a time, ‘2 
in. across ; floral bract broad, blunt, less than half as long as the short sessile ovary. 
Sepals broadly ovate, obtuse, spreading. Petals smaller than the sepals, oblong, spreading. 
Lip fleshy, as long as the sepals; the base with a wide blunt spur adpressed to and 
as long as the ovary, its interior with two calli near the mouth, one on the back wall 
and a larger one on the anterior wall; dorsal scale absent; lateral lobes small; the apical 
lobe oblong, convex, blunt; the edges thin and erose, the upper surface smooth. Column 
very short, stout, with no foot, but with a large cheek-like protuberance on either side 
of the rostellum. Anther depressed, with a long pointed beak ; pollinia two, obovoid, the 
caudicle triangular, cordate or oblong, much larger than the triangular gland. Saccolabium 
micranthum, Lindl. in Wall. Cat. 7300; Gen. and Spec. Orch. 220. Saunders Refug. 
Botan., t. 110; Hook. fil. Fl. Br. Ind. VI, 59. | 
Sikkim, at elevations from 2,000 to 3,000 feet; in flower during July and August; 
Pantling No. 78. Westward along the range to Dehra Dhoon, and eastward to 
Bhotan ; also in the Naga and Khasia Hills and in Tenasserim. 
The sepals and petals are white with large pink spots, the lip is entirely in 
or purple. The caudicle of the pollinia varies in form and is always fragile. In the 
Sikkim plant the spur of the lip equals the sepals in length, and the callus at the 
mouth of the spur is large and solitary, not double. As this callus protrudes so as to 
meet a smaller callus projecting from the posterior wall and thus to close the opening 
into the spur, the species is removed from Saccolabium to the genus Cleisostoma. 
PLATE 312.—Cleisostoma micranthum, King and Pantling. A plant, of natural sise. Fig. 1 a flower, 
2 floral bract, ovary, column with anther in situ, and lip, side view, 4 section of the foregoing, 
З lip, 5 apex of column, showing the processes by the sides of the rostellum, the stigma and the 
anther in situ, 6 under-surface of empty anther, 7 pollinia ; ай enlarged. 
7. CLEISOSTOMA GEMMATUM, King and Pantling. 
Stem slender, pendulous, 6 to 12 in. long. Leaves linear, curved, the margins 
much infolded, sometimes almost sub-terete, minutely 3-toothed at the apex, neither 
