Tas. 5589. 
ANGRACUM Cuarivanvm. 
M. Du Chaillu’s Angrecum. 
Nat. Ord. Orcuipex%.—Gynanpria Monanpria. 
_ Gen. Char. Perianthium patens. Sepala et petala subzqualia, libera. 
Labellum sessile, cam basi columne continuum, carnosum, indivisum, pe- 
talis consimile v. iis latius; calcare recto v. flexuoso cornuto, sepius subcy- 
lindraceo, perianthio equilongo v. multo longiore, raro obeonico. Colwmna 
nana, subteres, raro elongata et semiteres. Anthera 2-locularis, truncata. 
Pollinia 2, 2-partibilia; caudicula brevi v. elongata angusta, glandula tri- 
angulari v. lanceolata——Epiphyte caulescentes. Folia coriacea, ligulata, 
apice obligua v. 2-loba. Flores solitarii v. racemosi, albi virescentes v. 
citrini, sepe herbacei. 
Aner&zoum Chailluanum ; foliis valde coriaceis ligulatis 4-6 poll. longis 
1} poll. latis apice 2-lobis, lobis valde inequalibus rotundatis, margi- 
nibus undulatis, racemis 6-12-floris, bracteis amplis late ovatis sub- 
' acutis acuminatisve, floribus ex albo virescentibus, sepalis petalis 
et labello consimilibus 1} poll. longis anguste subulato-lanceolatis 
recurvis, calcare tenui elongato 3—5-pollicari, rostello valde elongato. 
This very distinct Angraecum was sent from the Gaboon 
to the Royal Gardens, by M. Du Chaillu, on his return from 
his last adventurous journey in Western Africa, and flowered 
in May of the present year. The same plant was also sent 
by M. Gustav Mann (collector for the Royal Gardens) from 
the Nun river. on the same coast, but has not flowered. It 
was named A. arcuatum by the late Dr. Lindley, in the 
Hookerian Herbarium, but differs much from that South Afn- 
can species in the greater size, large flowers, longer, more 
acuminate sepals and petals, the spur several times longer 
than the perianth, and in the longer leaves, with undulated 
margins. I have given this the name of its celebrated dis- 
coverer. 
Descr. A small, stout epiphyte. Stems four to ten inches 
long, as thick as the little finger. Leaves loosely imbricate, 
four to six inches long, an inch and a half broad, leathery, 
JULY Ist, 1866. 
