156
178
G. A. C. HERKLOTS
We found it first on April 6th, 1931 on Ma-on-shan, a number of plants but local in distribution, and this year it has been found in several ravines on the Hunchbacks in the dense shade of trees and rocks at about 1,500 feet. FLOWERING SEASON:-The last week in March and the months of April and May. In cultivation it has flowered in November and also in February. ILLUSTRATIONS :-Figure 6. An inflorescence and flowers drawn face and side view to same scale; figure 7, portion of plant showing leaf, young shoot, short zhizome and thick roots. Plate 24, figure 2, a flowering shoot about actual size.
CLEISOSTOMA, Blume.
Characters of Saccolabium but with a large dorsal callus in the spur below the column.
Peduncles
Epiphytes; pseudobulbs o, Leaves flat keeled or terete. lateral, flowers usually small spicate racemed panicled or subcorymbose. Sepals and petals adnate to the base of the column, spreading subsimilar, free, Lip sessile at the base of the column usually consisting of a large saccate conic cylindric spur, small lateral lobes and a small mid lobe; sac or spur not septate within and with a large scale or callus below the column. Column short, broad, truncate, rarely beaked, foot o; anther 1-or imperfectly 2-celled; pollinia 2, entire or 2-partite. (6) p. 54 (8) p. 195 and p. 200. DISTRIBUTION :-Twenty species confined to the Indo-Malayan region and
South China.
CLEISOSTOMA VIRGINALE, Hance.
This species was described from Hong Kong in 1877 by H. F. Hance (5) and as we have been able to find no description in English, or illustrations of this species, we give below in full a free translation of Hance's original Latin description and his explanatory notes. He spells the generic name Cleistoma not Cleisostoma, which is used by other writers.
Cleistoma virginale, new species. Leaves oblong and fleshy, veins within, upper surface deep green, middle lightly grooved, below paler some- what oblong, apex widely triangular-emarginate with very short points at the end of the mid-vein, 2-21⁄2 inches long, 9-to lines wide. Spikes lateral drooping, 4 inches long bearing 20-30 flowers. Rachis dark purple, furrow- ed, bearing flowers only above the middle. Bracts 3-4 lines, ovate-lanceolate upright, flowers 5 lines in diameter, very smooth, sessile; bracteoles lanceolate, reflexed, close set, Perianth segments, outer ones somewhat larger, greenish white, top hooded; lateral ones oblique-oblong somewhat acute; inner ones half as long oblique-obovate, obtuse, with purplish dots; labellum three lobed, lateral lobes wide, truncate, subfalcate with purple dots, and lobe linear-oblong, closely bent in, the lateral ones are folded along their length, incurved, pressed in against themselves; spur 11⁄2 lines long
The Hong Kong Naturalist.
December 1931.
Orchidaceae of Hong Kong
179
Figure 8. Cleisostoma virginale, Hance.
1. INCH
157
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