86 CXLVIII. OKCHIDE^. (J. D. Hooker.) [Thelasis. 



base of the column, erect, ovate or oblong. Column very short, sessile, 

 foot ; rostellum terminal, large, erect ; anther elongate, dorsal, erect, base 

 2-4 celled ; pollinia very minute, globose, attached by long threads to the 

 tip of the rostellum, gland small. Capsule very small, turgidly ovoid. 

 Species about 10, tropical Asiatic and Pacific. 



I am not well satisfied as to the character of lateral sepals in this genus, as to 

 their being winged or not; the sepals are very soft, and their exact structure not very 

 clear in specimens that have been dried, and again moistened. 



Sect. I. ETJTHELASIS. Pseudobulbs 1-2-leaved. 



* Lateral sepals distinctly strongly keeled or winged. 



1- T. pygrmsea, Lindl. in Journ. Linn. Soc. iii. 63; scape 1-2 in. 

 longer than the solitary linear leaf, spike very short lax-fld., lip ovate 

 acute contracted towards the tip. Par. fy Reichb. f. in Trans. Linn. Soc. 

 xxx. 145 ; Walp. Ann. vi. 923 ; Euproboscis pygmaea Griff, in Calc. Journ. 

 Nat. Hist. v. 371, t. 72 ; Wight Ic. t. 1732. 



NEPAL (Cult. in.Hort.Bot. Calc. fid. Griffith.) MALABAR, Jerdan. TENASSEEIM, 

 at Moulmein, Parish. 



Pseudobulbs |-f in. diam. Scape very slender, curved ; spikes in. long ; bracts 

 ovate, acuminate ; flowers ^ in. long ; dorsal sepal ovate-lanceolate acute, lateral 

 linear-oblong ; lip 3-nerved, with rounded sides from the middle to the base ; rostellum 

 2-fid. The Malabar plant seems the same as the Tenasserim, but is in a Peloria 

 state, triandrous, with the petals and lip similar, ovate-lanceolate, 1-nerved ; ovary 

 with imperfect ovules. 



Var. multiflora; leaf larger 3-4 by in., scape stouter 4-5 in., spike 1^-2 in. 

 Sikkim Himalaya, alt. 1000 ft., Treutler. 



2. T. ? capitata, Blume Bijdr. 386 ; scape 4-6 in. stout longer 

 than the solitary linear leaf, spike cylindric dense-fld., rachis pitted, lip 

 oblong-ovate obtuse. 



PERAK, ScortecMni. DISTRIB. Sumatra, Java. 



Pseudobulbs small, oblong, on a stout creeping rhizome. Leaf 3-4 in., obtuse or 

 subacute. Spike 1 in.; bracts very close set, ovate, acute, recurved; flowers T ^ in. 

 long ; dorsal sepal ovate-lanceolate, lateral oblong concave thickly keeled or shortly 

 winged ; petals lanceolate, acuminate ; rostellum elongate, subulate, entire. 

 Differs from the Suniatran capitata in the long spike, acuminate petals and entire 

 rostellum. It more resembles the raceme of P. triptera, R.f. of Manilla, which has an 

 ovate lip narrowed to the apex. 



3. T. elong-ata, Blume Orchid. Archip.Ind. 23, t. 7,/. 2, and t. 5, fig. 

 C ; scape 4-6 in. longer or shorter than the solitary linear leaf, spike 

 cylindric dense-fld., lip ovate acute or acuminate. 



SINGAPORE ; at Johore, &c., Ridley. LANGKAWI, Curtis. 



Pseudobulb very various in form. Leaves and spike as in T. capitata, from 

 which it differs in the form of the lip. Blume's figure is a very bad one, and does not 

 show the strong keels on the lateral sepals and angles of the ovary. The species of 

 this section are very difficult of discrimination in a dried state, and possibly capitata, 

 elongata, triptera and others are all forms of one. 



** Lateral sepals not strongly keeled or winged. 



4. T. bifolia, HooJc.f. Ic. Plant, ined.; scape 8 in. much longer than 

 the two opposite elliptic-lanceolate acuminate leaves, spike very lax-fid., 

 lip broadly elliptic obtuse. 



