ORCHIDACE^ 



Pakka Cave to Lobong, Topping 372 {Bur. Sci. 1722), November 1915. 

 Epiphyte. Flower reddish-orange with darker stripes on back of perianth. 



37. THELASIS Bl 



Six species of this genus are recorded from Borneo but none 

 previously from Mount Kinabalu. 



I. Thelasis carnosa A. &^ S. sp. nov. Herba crassa. Rhizoma 

 repens. Radices fasciculatae. Pseudobulbi angustissime cylindra- 

 cei, vagina obtecti, monophylli. Folium in sicco anguste lineare, 

 canaliculatum, plus minusve falcatum, viride probabiliter subcyl- 

 indraceum. Scapus folium multo excedens, suberectus, vaginis 

 nonnullis tubularibus praeditus. Racemus densissimus. Bracteae 

 inflorescentiae latissime triangulares, subito acutae, patentes. 

 Flores minuti ; perianthium tubulari-connivens. Sepala lateralia 

 oblonga, obtusa, carinata, carnosissima. Sepalum dorsale mem- 

 branaceum,oblongum,obtusum, apice multo incrassatum. Petala 

 spathulata, apice late rotundata, membranacea. Labellum carno- 

 sum in parte superiore praesertim, anguste deltoideum margini- 

 tus lateralibus involutis, apice rotundato. Gynostemium minu- 

 tum, processu rostelli lanceolato bidentato instructum. Anthera 

 anguste triangulari-lanceolata. 



Plant stout. Rhizome creeping, slender, deeply sulcate, about 

 4-5 mm. wide in the dried specimen, entirely concealed by sca- 

 rious imbricating sheaths. Roots numerous in fascicles, fibrous, 

 deeply sulcate and angled in section, about .8 mm. thick. Pseu- 

 dobulbs 1.5-2 cm. distant, about 1.4-2 cm. high, narrowly cylin- 

 dric and stem-like, closely sulcate-striate in the dried specimen, 

 monophyllous, concealed by a tubular foliaceous sheath. Leaf 

 16-21.1 cm. long, very narrowly linear, more or less falcate, cori- 

 aceous, abruptly acute, with a deep groove extending from the 

 base to the apex, apparently fleshy and subcylindric in the living 



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