Polystachya.'] cxxxiii. oRCHiDEiE (rolfe). 129 



broadly triangular-oblong, slightly bidentate, dorsally flattened. Column 

 stout, 1\ lin. long. Chin oblong, obtuse, 3| lin. long. 

 Upper Guinea. Cameroon Mountains, 5000 ft., Mann, 2110 ! 



67. P. elastica, Lindl. in Journ. Linn. Soc. vi. 131. Plant G in. 

 high. Stems short, slightly thickened at the base, 2-3-leaved. Leaves 

 linear-lanceolate, subacute, 2-3 in. long, 2-2J lin. broad. Scapes 6 in. 

 long, pubescent ; racemes simple, few-flowered. Bracts very broadly 

 ovate, acute or apiculate, |-1 lin. long. Pedicels 5 lin. long. Dorsal 

 sepal ovate-oblong, acute, 3 J lin. long ; lateral broadly and obUquely 

 triangular-ovate, mucronate. Petals subspathulate-oblong, obtuse or 

 apiculate, 3| lin. long. Lip doubly curved into the form of an S, 

 trilobed, ^ in. long ; the basal third broadly unguiculate, with a high 

 callus, narrow and apiculate in front ; the middle third oblong, covered 

 with a longitudinally-grooved hairy cushion, and bearing a pair of 

 rounded, crenulate side lobes near its apex ; the apical third incurved, 

 obovate, truncate, very concave, and with an apiculate tooth on the 

 back at its base. Column stout, Ij lin. long. Chin triangular-oblong, 

 i)h lin. long. — Dendrohium roseum, Sw. in Schrad. Neues Journ. i. 1)7 ; 

 Pers. Syn. PI. ii. 523 ; Lindl. Gen. & Sp. Orch. 92. 



Upper Cruinea. Sierra Leone : Bagru River, Mann, 902 ! and without precise 

 locality, Afzeliusl 



A very remarkable species with a large mass of thin, flat roots like those of the 

 leafless Angrceciims. Lindley says that its labellum, which is a long, narrow, yellow 

 body with an inflexed terminal lobe, is thrown back forcibly when the flower expands, 

 so as to hang down over the hood formed by the united lateral sepals. By what 

 mechanical contrivance this is eSected I have been unable to determine. In the bud 

 state the tooth on the back of the lip is exactly opposite to the apex of the sepals and 

 petals, and the concave front lobe of the lip is tucked away behind the column in a 

 remarkable manner. 



68. P. fusiformis, Lindl. Bot. Reg. 1824, suh t. 851. Plant 6-9 

 in. high. Pseudobulbs fusiform-oblong, superposed, 2-3 in. long, 3-4- 

 leaved. Leaves oblong or oblong-lanceolate, subacute, 2-5 in. long, 

 4-7 lin. broad. Panicles "2-2^^ in. long. Bracts triangular, acuminate, 

 J-1 lin. long. Pedicels 2 lin. long. Dorsal sepal ovate, apiculate, 1 

 lin. long; lateral resembling the dorsal, but broader. Petals oblong 

 or subspathulate-oblong, subacute, 1 lin. long. Lip 1 lin. long, un- 

 guiculate, trilobed ; side lobes rounded-oblong, obtuse : front lobe ovate, 

 subobtuse or apiculate; disc subglabrous, without a callus. Column 

 stout, J lin. long. Chin saccate, obtuse, 1 lin. long. Capsule oblong, 

 4 lin. long. — Kranzl. in Engl. Pfl. Ost-Afr. C. 155. Deiulrohium 



fvsiforme, Thou. Orch. lies Afr. t. 86. 



nxozaml). Bist. German East Africa: Usambara; Mascheua (ex Kriitizliu). 

 Also found in Madagascar, Mauritius, Reunion, and the Seychelles. 1 have seen 

 no Tropical African specimens, and the description is made from Mascarene ones. 



69. P. superposita, Reichh. f. Otia Bot. Hamb. ii. 111. Pseudo- 

 bulbs slender, cylindric, superposed, each arising from above the 

 middle of the previous one, 2-3J in. long, 3-4-leaved. Leaves linear 



