36. 
36a. 
37. 
2/0: 
38. 
38a. 
oo. 
39a. 
40. 
40a. 
Stem ascending from a rhizomatous or subrhizomatous 
base with fleshy tuber-like roots originating from distant 
to more or less approximate nodes; Stigmata confluent; 
rostellum oblong to ligulate, excised at apex ........... 
Ra cMe Raia ce seeas OnE ead wea wees seers 35. Hapalorchis 
Stem caespitose with fasciculate roots or tubers; stigmata 
either confluent or separate; rostellum never oblong or 
ligulate,-OT EXCISED AUADEX. oc4s5c0s< yas eeeene races 37 
Plants delicate; sepals connivent, subparallel; dorsal sepal 
free from column; lateral sepals oblique, sessile; column 
Te ass ee ee nee tees 38 
Plants robust; sepals divaricately spreading; dorsal sepal 
adnate basally to back of column; lateral sepals with a 
short, didymous base; rostellum arrect, obovate to angular 
ELT e Te SOLE T ee Tee Ee eT ee 36. Buchtienia 
Stigmata 2, separate; rostellum subquadrate-flabellate, 
truncate, sulcate in middle; roots fleshy, fasciculate, geo- 
VUES. soins ee ses essere ney eka es 37. Stigmatosema 
Stigmata 2, confluent; rostellum narrowly triangular, esul- 
cate in middle; base of plants with a single tuber; growing 
among mosses on tree trunks .............. 38. Stalkya 
Column-foot embedded full length internally in ovarian 
tissue and with it the more or less connate lateral sepals 
form a prominent, internal nectary or cuniculus without 
any externally observable line of adnation ............. 
eT eee eC Te ee ee eee re ee rere 39. Sarcoglottis 
Column-foot decurrent on ovarian wall and with it the free 
or partially connate lateral sepals form an externally 
observable line of adnation ................00000 008s 40 
Dorsal sepal free from back of column; lateral sepals 
basally connate into a ventricose, saccate or spur-like vesi- 
cle which is manifested often in a pronounced mentum; 
stigmata 2, separate to variously approximate; lip com- 
monly sagittate at base, rarely auriculate ....40. Pelexia 
Dorsal sepal partially adnate to back of column; lateral 
sepals never form a ventricose or saccate base, nor a 
mentum; stigmata 2, confluent; lip either unguiculate with 
auriculate to cordate base, but never sagittate or com- 
296 
