284 CXXXIII. ORCHIDEZ (BROWN). [ Disa. 
oblong, obliquely subacute, with a dorsal apiculus, whitish mottled with 
rosy, lined with blackish-purple at the base. Petals 2—2} lin. long, 
14-14 lin. broad, entire, obliquely ovate in general outline, acute, 
anterior side broadly semiovate, posterior side narrower, semisagittate 
at about the middle; this narrow part is strongly infolded, colour 
orange-yellow running into greenish, margined with purple, base dark 
purplish (Welwitsch). Lip 2 lin. long, 4 lin. broad near the apex, 
oblanceolate or subspathulate, obtuse, slightly keeled down the face 
from the margins being more or less replicate. Anther horizontal. 
Rostellum rather large, raised above the stigma, shortly bifid.— 
D. Macowani, Reichb. f. Otia Bot. Hamb. ii. 106. 
Lower Guinea. Angola: Huilla; Morro de Lopollo, above 5000 ft., 
Welwitsch, 714! 
Also in South Africa. 
According to Welwitsch, after the full development of the flower the petals 
emerge from the dorsal:sepal, and the spike appears yellow in the lower half and 
gradually deeper rose-coloured towards the apex. 
16. D. equestris, Reichb. f. in Flora, 1865, 181. Plant 9-18 in. 
high, glabrous. Leaves of barren shoot 6 in. long, linear-lanceolate. 
Flowering stem spotted with purple, bearing 4-8 erect leaves, lower 
2-3 in. long, 5-6 lin. broad, upper gradually smaller, lanceolate, 
oblong-lanceolate, or ovate-oblong, acute or acuminate. Spike lax, 
elongating, 2—6 in. long, $-1} in. diameter. Bracts greenish-purple, 
3-6 lin. long, 2-3 lin. broad, elliptic-ovate, obtuse or acute. Dorsal 
sepal 3-4 lin. long, 2-3 lin. broad, violet-purple, extinguisher-shaped, 
gradually tapering from the mouth into a slightly clavate, very 
obtuse, stout, horizontal or ascending spur, 1—14 lin. thick, 5-7 lin. 
from mouth to tip. Lateral sepals deflexed, 23-4 lin. long, 14-2 lin. 
broad, violet-purple, oblong, obtuse, with a minute dorsal apiculus. 
Petals white with a purple spot at the apex, 2-24 lin. long, entire, 
subspathulate; basal half auricled in front, with a crest or keel 
down its inner face; apical half dilated, 3 lin. broad, curved forward, 
subelliptic ; posterior margin revolute ; apex obtuse or slightly emar- 
ginate. Lip 2-24 lin. long, 14 lin. broad, elliptic or obovate, obtuse, 
velvety papillose, white at the base, red-purple at the apex. Anther 
horizontal, 1-1} lin. long. Rostellum with short ascending sides, 
and a tubercular fold between the anther-cells. 
yet Guinea. Angola: Huilla; Morro de Lopollo, 4000-5400 ft., Welwitsch, 
Mozamb. Dist. British Central Africa: Nyasaland; Shire Highlands, near 
Blantyre, Last ! 
17. D. concinna, V. E. Brown. Plant about 1 ft. high, glabrous. 
Leaves about 3-5 to a stem, 14-3} in. long, as long as or longer 
than internodes, 8-9 lin. broad, ovate-lanceolate, acuminate or acute 
erect, and more or less embracing the stem, gradually decreasing 
upwards. Spike 2-6 in. long, ? in. in diameter, elongating and 
becoming somewhat lax. Bracts shorter than the flowers, 3-6 lin. long; 
