338 
marginibus superne spinescentibus. Sepala 4, obtusa, dorso plus 
minusve pubescentia, distincte molliter ciliata ; anticum oblongo- 
ovatum, apice denticulatum vel integrum, usque ad 1°5 cm. longum, 
9 mm. latum ; posticum ovatum, usque ad 1°5 cm. longum, 11 cm. 
latum ; lateralia elliptico-ovata, 1 cm. longa, 7 mm. lata. Corollae 
tubus 7 mm. longus, durus, extra glaber, intus dense pubescens ; 
limbus 5-lobatus, pubescens, usque ad 3°5 cm. longus, 3°5 cm. latus. 
Stamina 4, filamentis inter se aequalibus 2 em. longis glabris, 
antheris 5 mm. longis dense ciliatis ; pollinis granula longe ellip- 
soidea, 50 w longa, 30 u diametro. Discus 0°5 mm. altus. Ovariwm 
2 mm. altum, 1 mm. diametro, glabrum; stylus 2°5 cm. longus, 
glaber, apice breviter et aequaliter bifidus. Acanthus arhoreus, 
Forsk., var. pubescens, Thoms, in Speke’s Nile Journey, Appendix, 
p. 643, and Oliv. in Trans. Linn. Soc. vol, xxix., p. 129. A. arboreus, 
TropicaL ArricA. Uganda: Botanic Station, Entebbe, 
“forms a bush 10 ft. high with handsome, pink, very showy flowers, 
common,” 4A. Mahon ; Buddu, 1170 m. altitude, “a white flowered 
variety,’ M. T. Dawe 237; Elgon District, Sir Evan James ; 
between Entebbe and Kampala, Miss M. Mason; without exact 
locality, “a stout shrubby plant, branched, 3-7 ft. high, flowers 
pink. Roadsides and grassland, Uganda, very common. I have 
also seen a variety with white flowers but have no specimen,” 
Rev. C. T. Wilson 94; without exact locality, “very handsome 
pink Acanthacea all over Uganda and Unyoro, 12-15 ft. high,” 
M.S. Evans 737; British East Africa: Kavirondo, Nandi Range, 
“a tall shrubby plant, wet ground,” Scott Elliot 7057 ; Mutagaru, 
Kakameja Forest, “a very common shrub as undergrowth in forests 
in Nyanza Province and parts of Uganda,” altitude 1350-1500 m., 
Je 2K Moon 572; without exact locality, C. F. Eliott 244 ; German 
East Africa : Usui (Ussuwi) in Uzinza (Usindja) District, Speke and 
Grant, 136 ; Ruzizi Valley in the open plain, Kassner 3185. 
LIV.—NEW ORCHIDS; DECADE 41. 
401. Megaclinium ugandae, Rolfe; a M. endotrachyde, Krinzl., 
Scapo breviore, sepalis lateralibus acuminatis et petalis latioribus 
differt. 
Herba epiphytica. Pseudobulbi tetragoni, conico-oblongi, 5 cm. 
longi, 1°6 em. lati, diphylli. Folia oblonga vel elliptico-oblonga, 
subobtusa, 7 cm. longa, 2 cm, lata, subcoriacea. Scapus circiter 
12 em. longus, basi vaginis tubulosis obtectus ; rachis oblonga, 
acutangula, 6°7 cm. longa, 8 mm. lata, nervo mediano eccentrico. 
Bracteae triangulares, acuminatae, acutae, reflexae, 3-4 mm. longae. 
Pedicelli 5-6 mm. longi. Flores circiter 2 em. distantes, parvi. 
- Sepalum posticum suberectum, subspathulato-oblongum, obtusum, 
7 mm. longum ; sepala lateralia late triangularia, reflexa, acuminata, 
6-; mm. longa; mentum subsaccatum, 2 mm, longum, Petala 
