Disa.] CXXXIII. ORCHIDEÆ (BROWN). 277 
Petals obliquely ovate, semisagittate on 
the dorsal side . 5 e . 15. D. versicolor, 
Spur stout, not more than three times as long 
as thick. 
Dorsal sepal erect, its mouth more or less in 
a line with the axis of the ovary. 
Spur 1—12 lin. thick or broad at the apex. 
Bracts 2-3 lin. broad. Lateral sepals 
minutely apiculate. : . 16. D. equestris. 
Bracts 1-13 lin. broad, Lateral sepals 
with an apiculus 1 lin. long . . 17. D. concinna. 
Spur 3-2 lin. thick at the apex. . 18. D. pulchella. 
Dorsal sepal reflexed, its mouth at a right 
angle to the axis of the ovary. Lip 
spathulate-oblong . S . . 19. D. aperta. 
Lip deeply fringed . e S : ; . 20. D. hamatopetala. 
1. D. Carsoni, N. E Brown. Plant 16-18 in. (or more) high, 
glabrous. Stem clothed to the top with appressed, sheath-like, acumi- 
nate leaves, the lower veined and mottled with red. Spike about 
6 in. long, 34-4 in. diameter, lax, 10-12-flowered. Flowers large. 
Bracts shorter than the flowers, 1-1? in. long, 5-7 lin. broad, ovate- 
lanceolate, acuminate. Dorsal sepal witb an erect, incurved claw 
10-13 lin. long, 1-1} lin. broad, and an elliptic, obtuse, concave limb 
8-9 lin. long, 6 lin. broad, with a clavate spur from the middle of its 
back, 7-8 lin. long, 1 lin. thick near the apex. Lateral sepals widely 
Spreading and ascending, 14 in. long, 6-64 lin. broad, oblanceolate- 
oblong, obtuse, concave in the apical part, obliquely attached at the 
base. Petals 14—12 in. long; the basal part with large semi-eiliptic 
auricles 6-7 lin. long, 34—44 lin. broad; the upper part linear, fol- 
lowing the curve of the claw of the dorsal sepal to the base of the 
limb, and in this part 4 lin. broad, then dilated to 1ł}—14 lin. broad, 
and abruptly curved outwards and then upwards, like a pair of horns, 
the part above the curve 6-7 lin. long. Lip pendulous, 12-14 lin. long, 
+1 lin. broad, linear, acute. Anther erect, 4 lin. long, oblong. Ros- 
tellum short, emarginate, not folded between the anther-cells. 
Mozamb. Dist. British Central Africa: Fwambo, S. of Lake Tanganyika, 
Carson, 22 ! 
This is the finest of all the Tropical African species of Disa, and evidently a very 
handsome plant. The stem-leaves appear to be glaucous and somewhat tinted with 
red. The bracts appear to be of a reddish colour, and the inside of the limb of the 
dorsal sepal and apical part of the petals are distinctly spotted with purple, whilst the 
large lateral sepals look as if they may have been of an orange tint. 
2. D. erubescens, Rendle in Journ. of Bot. 1895, 297. Plant 
15-22 in. high, glabrous. Stem clothed with coriaceous, lanceolate, 
acuminate, appressed sheath-like leaves 14-3 in. long, the basal sheaths 
Spotted. Leaves of barren stem a foot long, 4—6 lin. broad, linear, 
Spike 3-5 in. long, lax. Flowers large, deep red. Bracts shorter than 
the flowers, 1-1} in. long, 4-6 lin. broad, elliptic-ovate, acuminate. 
orsal sepal with an erect channelled claw 5-6 lin. long, and a boat- 
