Disperis. | CXXXIII. ORCHIDEÆ (ROLFE). 291 
sepals obliquely oblong, acute, 2 lin. long. Lip cuneate, divergently 
2-armed ; arms papillose ; appendage elongate-oblong, fleshy, papillose. 
Column very stout ; arms of rostellum linear-falcate, 1 lin. long. 
Lower Guinea. Angola: Pungo Andongo, Welwitsch, 694! 
The flower examined was in a young state, and so membranous that I could not 
make out the exact details, hence the characters are chiefly repeated from Reichen- 
bach. 
6. D. Johnstoni, Reich. f. ex Oliv. in Trans. Linn. Soe. ser. 2, 
ii. 8349 (name only). Stem slender, 4-6 in. high, 2-leaved. Leaves 
alternate, sessile, cordate-ovate or ovate-oblong, subobtuse or apiculate, 
8-13 lin. long, 4-8 lin. broad, with an apiculate sheath at the base. 
Racemes short or subcorymbose, 2—5-flowered. Bracts ovate, acute or 
apiculate, 24-4 lin. long. Pedicels 4-6 lin. long. Dorsal sepal united 
with the petals into a concave obtuse hood, 3 lin. long, slightly gibbous 
behind ; lateral sepals obliquely semiobovate, apiculate, united in the 
basal third. Lip with slender flattened claw, 13 lin. long ; basal third 
adnate ; free part bearing a pair of suberect, linear, obtuse appendages, 
over } lin. long, below the middle of the free part ; limb reflexed, ovate, 
membranous, ł lin. long, exserted from the galea, with a broad, flattened, 
obtuse erect tooth or crest near the base. Column 1 lin. long; arms of 
rostellum 4 lin. long. Capsule oblong, 5—6 lin. long. 
Mozamb. Dist. German East Africa: Kilimanjaro, 5000-6000 ft., Johnston ! 
7. D. Kerstenii, Reichb. f. Otia Bot. Hamb.ii. 102. Stems slender, 
6-9 in. long, 2-leaved, with an acute sheath near the base. Leaves 
opposite, very shortly petioled, cordate-ovate, subacute or apiculate, 
14-14 in. long, 10-12 lin. broad. Raceme short, 2—4-flowered. Bracts 
ovate or ovate-lanceolate, acuminate, 4—6 lin. long. Pedicels 5-6 lin. 
long. Flower violet. Dorsal sepal galeate, 4 lin. long, with inflexed 
apex ; lateral spreading, free, obliquely obovate, inner margin pro- 
duced into a spur 1 lin. long. Petals with a narrow claw united to 
the margin of the dorsal sepal; apex extended into free quadrate-dola- 
briform wings, 2 lin. broad, and nearly as long. Lip with a narrowly 
linear curved claw, 54 lin. long; basal sixth adnate ; limb sharply re- 
flexed, triangular-oblong, pilose, 4 lin. long, with incurved subobtuse 
apex; appendage deeply bilobed, 2} lin. long, exserted over the lateral 
Sepals; the arms slightly dilated above, with a curved subacuminate 
apex, and a reflexed, linear tooth, 14 lin. long, from the broad inner 
angle. Column very broad, 1 lin. long; rostellum bilobed ; arms 
slender, 1 lin. long. 
Mozamb, Dist. German East Africa: Kilimanjaro; Chagga District, 3000- 
4000 ft., Kersten, and at 7500 ft., Johnston ! 
8. D. Preussii, Rolfe. Stem rather slender, 5 in. high, 2-leaved. 
aves opposite, shortly petioled, cordate-ovate, subacute or apicu- 
late, 1 in. long, 10 lin. broad; petioles 14 lin. long. Racemes 
3- to 1-flowered. Bracts ovate, acuminate, 2-6 lin. long. Pedicels 
3 lin. long. Dorsal sepal almost reduced to an Oblong, obtuse spur, 
