12H cxxxiii. ORCHiDE^ (rolfe). [Polystochya. 



63. P. Preussii, Krdnzl. in Engl. Jahrh. xvii. 51. Plant 3-6 in. 

 high. Pseudobulbs with an ovoid or ovoid-oblong base, J-1 in. long, 

 narrowed above, 2-4 -leaved. Leaves oblong-linear, obtusely bidentate, 

 1-3 in. long, 3-5 lin. broad. Racemes simple, |-1| in. long. Bracts 

 triangular-ovate, acuminate, |-1J in. long. Pedicels lJ-2 lin. long. 

 Dorsal sepal ovate-oblong, acute, 2 J lin, long ; lateral broadlj'- 

 triangular-ovate, acuminate. Petals lanceolate, acute, 2\ lin. long. 

 Lip 3J lin. long, spathulate, with a long, pubescent claw ; limb 

 suborbicular, apiculate ; disc with a large 4-lobed callus at the base 

 of the limb. Column stout, 1^ lin. long. Chin oblong, obtuse, 2J lin. 

 long. 



Upper Cruinea> Cameroon Mountains : Buea, 6800-8200 ft., epiphytic on 

 Hypericum, Leueothoe, &c., Prenss, 934 ! 1021 ! 



The remarkable callus indicates a close affinity with P. alpina, Lindl. 



64. P. alpina, Lindl. in Journ. Linn. Soc. vi. 131 ; vii. 220. Plant 

 only about 2 in. high. Stems dwarf, slightly swollen at the base, 

 2-leaved. Leaves linear-oblong, unequally bidentate, 1-lJ in. long, 

 Ij-lj lin. broad. Scapes short, hispidulous, 1-flowered. Bracts ovate, 

 acuminate, f lin. long. Pedicels 2 lin. long. Lorsal sepal ovate-oblong, 

 obtuse, concave, 2 lin. long ; lateral triangular-ovate, acute. Petals 

 lanceolate, acute, 2 lin. long. Lip 3 J lin. long, unguiculate ; claw 

 with incurved, ciliate margin ; limb broadly ovate, acute, or apiculate ; 

 callus large, fleshy, 6-lobed, flat, situated at the base of the limb. — 

 Engl. Hochgeb. Fl. Trop. Afr. 187. 



Upper Guinea. Fernando Po, 6000 ft., on trees, Mann, 647 ! 

 A very small plant with solitary flowers, dark red-brown when dried, remarkable 

 for the large, fleshy, 6-lobed callus. 



65. P. disticha, Rolfe in Bolet. Soc. Brot. ix. 130. Plant 4 in. 

 high. Pseudobulbs narrow, 2 in. long, 1-leaved. Leaves linear-oblong, 

 obtuse, 2 in. long, \ in. broad. Racemes simple, 8-10-flowered. Bracts 

 distichous, equitant, triangular, acute, rigid, 1 lin. long. Pedicels 

 rugose, 3 lin. long. Dorsal sepal ovate-oblong, obtuse, 1 J lin. long ; 

 lateral broadly ovate, subacute. Petals oblong, obtuse, 1^ lin. long. 

 Lip entire, rounded-oblong, obtuse or apiculate, as long as or longer 

 than the sepals ; disc pubescent. Column stout. 



Xiower Cvuinea. ' St. Thomas, Quintas, 28 ! 



66. P. caloglossa, Eeichb. f. Otia Bot. Harah. ii. 111. 'Plant 

 10-12 in. high. Stems cylindrical, elongate, 4-leaved. Leaves lanceo- 

 late-oblong, acuminate, 2i-4 in. long, 7-12 lin. broad. Panicles 

 slightly branched, about \h in. long, glabrous ; rhachis very flexuose. 

 Bracts distichous, conduplicate, triangular, acute, \\-l lin. long. 

 Pedicels 3 lin. long. Dorsal sepal ovate-oblong, acuminate, 5 lin. long ; 

 lateral broadly triangular-ovate, acuminate. Petals elliptic-lanceolate, 

 acute or apiculate, 4 lin. long. Lip 4 Un. long, broadly unguiculate, 

 limb reniform, orbicular, obtuse or apiculate; disc glabrous; callus 



