ORCHIDACE.E 



7. Thrixspermum quinquelobum sp. nov. Radices fibratas, gla- 

 bra?, elongate. Caules abbreviati, ± 1 cm. longi, complanati, foli- 

 osi, circiter 5 mm. in diametro. Folia valde incrassata, carnosa, in 

 sicco rugosa, lineari-ligulata, anguste ensiformia, oblique ascen- 

 dentia, 3.5-10 cm. longa, ± 4 mm. lata. Pedunculi, infra race- 

 mum, graciles, sub-filiformes, circiter 8 cm. longi, uni-bibracteati, 

 bracteis triangulis, minutis. Racemus dense bracteatus, usque ad 

 1.5 cm. longus, bracteis rigidis, imbricantibus, paten tibus, acutis, 

 2 mm. longis. Flores albidi, succedanei, membranacei. Sepala lat- 

 eralia suborbicularia, obtusa, 4 mm. longa, vix 4 mm. lata. Se- 

 palum dorsale galeam formans, valde concavum. Petala elliptico- 

 ovata, membranacea, 3.5-4 mm. longa. Labellum unguiculatum, 

 leviter saccatum vel concavum, quinquelobum ; lobi posteriores 

 quam lobi anteriores multo majores, falcato-lanceolati, 4 mm. 

 longi, circiter 1 mm. lati, acuminati, acuti ; lobi laterales anteri- 

 ores triangulari-lanceolati, valde acuti, 3 mm. longi, prope me- 

 dium .5 mm. lati, membranacei; lobus medius triangulus, carno- 

 sus, vix 1 mm. longus, ad marginem comosus, capilli elongati, ± 1 

 mm. longi, extus dense pubescens. Discus pubescens. Gynoste- 

 mium ± 3 mm. longum, in pedem membranaceum productum. 



The labellum recalls that of Sarcochilus hirtulus Hook. f. 



(Ic. PI. 2121), but the posterior lobes are larger than the anterior 



lateral lobes, the middle or terminal lobe is densely long hairy 



on the margin, as in Dendrobium scopa Lindl., and in place of 



a distinct sac there is merely a depression of the disc. The habit 



is also suggested by Sarcochilus hirtulus, but in Thrixspermum 



quinquelobum the leaves are narrower, usually conduplicate (in 



dried specimens), and the bracts recall those of the raceme of 



T. pardale Schltr. 



Luzon, Laguna Province, San Antonio, M. Ramos Bur. Sci. 16562, Sep- 

 tember 22, 1912. On tree in forest. 

 [ 206 ] 



