51 
1 was certainly wrong in referring this plant to C. viridis, from which it 
differs in its sepals and petals being much narrower, the flowers less 
green, the lip larger, and of a different form in its upper lobe. 
3. C . jugosns (Maxillaria jugosa, Lindl. in Bot. Reg. 1841. misc. 104.) ; se- 
palis oblongis incurvis obtusis, petalis conformibus concavis basi angus- 
tatis, labelli sigmoidei oblongi unguiculati pilosi jugosi lobis lateralibus 
nanis obtusis, intermedio semi-circulari, columna apice lobata bisulca 
villosissima. Brazil. Near C. placanthera, from which it differs 
in having the flower of a globose figure, with much less linear sepals 
and concave oblong petals narrowed to the base. These parts are of a 
rich cream colour, speckled with crimson. The lip has quite a different 
form, being semicircular at the tip, deeply furrowed and closely covered 
with short hair. The column has two deep furrows in front almost 
buried in hairs. 
66. CEREUS biformis. 
C. biformis ; ramis alatis articulatis crenatis, sterilibus oblongis sessilibus, 
floridis lanceolatis basi teretibus, petalis linearibus acutissimis, stigmate 
5-lobo. 
A curious and very pretty plant from Honduras, commu- 
nicated by Sir Charles Lemon. It has bright rose-coloured 
flowers, not unlike those of Cereus flagelliformis, I hope soon 
to be able to figure it, with a full description by Mr. Booth. 
67. BIFRENARIA. 
This genus differs from Maxillaria proper in having its 
pollen-masses attached to a short gland, by a pair of distinct 
straps, or caudiculm, instead of one ; a character, minute in- 
deed, but constant and readily detected, although often over- 
looked. On that account several species have been referred to 
Maxillaria, as I have now ascertained, and it is not improbable 
that others may still lie unknown among that large and trou- 
blesome genus. The following are characters of all of which 
I possess any certain information. 
Bifrenaria, Lindl. Sepala patula, libera, subsequalia; late- 
ralia cum basi producta columnse connata. Petala sepalis 
duplo minora. Labellum cum pede columnse articulatum, 
cucullatum, trilobum, medio callosum. Columna brevis, 
semiteres. Anthera subcristata. Pollinia 4, per paria in- 
cumbentia, caudiculis duabus distinctis, glandula oblonga. 
Herb® epiphytse, pseudobulbosse. Folia terminalia 
subsolitaria, plicata, cartilaginea. Pedunculi radicales, 
uniflori v. racemosi, saepe elongati. 
