128 CXXXIII. ORCHIDEÆ (ROLFE). [Polystachya. 
63. P. Preussii, Kränzl. in Engl. Jahrb. xvii. 51. Plant 3-6 in. 
high. Pseudobulbs with an ovoid or ovoid-oblong base, }—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, 3-1} in. long. Pedicels 15—2 lin. long. 
Dorsal sepal ovate-oblong, acute, 2} lin. long; lateral broadly 
triangular-ovate, acuminate. Petals lanceolate, acute, 24 lin. long. 
Lip 34 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, 24 lin. 
long. 
Upper Guinea. Cameroon Mountains: Buea, 6800-8200 ft., epiphytic on 
Hypericum, Leucothoe, &e., Preuss, 934! 1021! 
The remarkable callus indicates a close affinity with P. a/pina, 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—14 in. long, 
14-14 lin. broad.. Scapes short, hispidulous, 1-flowered. Bracts ovate, 
acuminate, 2 lin. long. Pedicels 2 lin. long. Dorsal sepal ovate-oblong, 
obtuse, concave, 2 lin. long; lateral triangular-ovate, acute. Petals 
lanceolate, acute, 2 lin. long. Lip 34 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. 139. Plant 4 in. 
high. Pseudobulbs narrow, 2 in. long, l-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, 14 lin. long; 
lateral broadly ovate, subacute. Petals oblong, obtuse, 14 lin. long. 
Lip entire, rounded-oblong, obtuse or apiculate, as long as or longer 
than the sepals; disc pubescent. Column stout. 
Lower Guinea. St. Thomas, Quintas, 28! 
66. P. caloglossa, Reichb. f. Otia Bot. Hamb. ii. 111. Plant 
10-12 in. high. Stems cylindrical, elongate, 4-leaved. Leaves lanceo- 
late-oblong, acuminate, 24-4 in. long, 7-12 lin. broad. Panicles 
slightly branched, about 14 in. long, glabrous; rhachis very flexuose. 
Bracts distichous, conduplicate, triangular, acute, 14-2 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 lin. long, broadly unguiculate, 
limb reniform, orbicular, obtuse or apiculate; disc glabrous; callus 
