Cleisostoma simondii

Cleisostoma simondii is a species of orchid that grows upon larger trees.
Found from Assam, eastern Himalayas, Nepal, Sikkim, Thailand, Laos, Fujian, Guangdong, Hainan and Yunnan provinces of China, Hong Kong and Vietnam in tropical and subtropical forests at elevations of 400 to 1100 meters.

The plant is erect, terete leafed, small sized, hot to warm growing monopodial epiphyte that is found at elevations of 100 to 1000 meters with an erect stem enveloped completely by imbricating, leaf bearing sheaths and carrying terete, fleshy, linear, subacute to obtuse, sessile, jointed leaves that blooms on an axillary, arching then pendulous, slender, 4 to 11.2" [10 to 28 cm] long, simple to paniculate, several [11 to 20] flowered inflorescence with basal and then iserted at intervals, tubulbar, cylindric, ovate, triangular apically sheaths and lanceolate, subacute floral bracts and carrying small, long-lasting flowers that can occur at any time but most often in the fall and winter.
Cleisostoma simondii is found in northeastern Hong Kong.

A cluster of Cleisostoma simondii orchid plants on a tree in northeastern Hong Kong.