ORCHIDACE^ 



above and carinate beneath, the margins re volute. Inflorescence 

 risHig between a pair of leaves, very short, two- (or three-?) 

 flowered; rachis zigzag. Pedicellate ovary about 1.5 cm. long, 

 slender, slightly twisted and finely grooved. Perianth segments 

 rather thick, pellucid in the dried specimen, undulate. Lateral 

 sepals about 1 cm. long, 4.4 mm. wide, oblong, the anterior mar- 

 gin — near the base — abruptly dilated, rounded to the subacute 

 apex which is dorsally conspicuously carinate, three- to five- 

 nerved. Dorsal sepal about 9 mm. long, 4.6 mm. wide near the 

 base, broadly oblong, rounded at the slightly oblique apex which 

 is dorsally somewhat carinate, concave, three- to five-nerved. 

 Petals about 1 cm. long, 3.7 mm. broad across the middle, lance- 

 oblong, broadly rounded at the apex, three- to five-nerved. Lip 

 sigmoid in longitudinal section, the center channeled and the 

 sides nearly conduplicate particularly at the base of the lamina, 

 when spread out about 9 mm. long, 7.5 mm. broad, obtriangu- 

 lar, deeply three-lobed; claw deeply concave, gradually spread- 

 ing into the lamina; lateral lobes about 2.5 mm. long, broadly 

 rounded ; middle lobe about 3 mm. long, 3 mm. wide at the base, 

 triangular, obtuse, verrucose-thickened ; two parallel keels — 

 thickened at the base — extend almost to the parting of the lobes 

 where they terminate in pyriform calU approximate to a similar 

 median caUus; the median line carinate below. Column about 

 5 mm. long, stout, narrowly winged especially near the base. 



Dendrobium tricallosum is apparently very similar to JD. lahu- 

 anum Lindl., but varies in lip characters. From D. radicosum 

 Ridl., it is separable in having more distant pseudobulbs, larger 

 differently shaped leaves and distinct middle lobe of the lip. The 

 markings of the lip are similar to those of Z>. longipes Hook. f. 

 KiNABALU, Clemens, November-December 1915. 



15. Dendrobium (§ Crumenata) tridentatum A. S^ S. sp. 



[ 115] 



