36 
variety, and has larger flowers than any of the racemose 
species of the genus. Sir W. Hooker has observed a gland 
and caudicula in my Polystachya macrantha (Bot. Mag. t. 
3707.), which is probably the Dendrobium galeatum of 
Swartz; I had previously noted the same thing in P. ramu- 
losa (Bot. Reg. 1838. misc. no. 144.), and 1 find a similar 
structure in the present species; it is therefore probable that 
the genus Polystachya should be placed in Vandew, among 
the genera belonging to which subdivision a better station 
may be found for it than next to Dendrobium. 
45. ISOCHILUS vidum : pseudobulbis fusiformibus attenuatis squamis pal- 
lidis membranaceis arcté vestitis, foliis solitariis linearibus apice obscuré 
2-3-dentatis, racemo capillari secundo nutante subtrifloro folio multó bre- 
viore, sepalis petalisque ovatis concavis patulis, labello cordato revoluto 
apice foveato basi mellifero. 
A small dingy-flowered plant, imported from Mexico by 
George Barker, Esq. of Birmingham. Its livid semitrans- 
parent flowers, and slender pedicels, are accompanied by 
spindle-shaped pseudobulbs, tightly covered with sheaths, 
resembling in colour the external skin of the onion which 
gardeners call ‘ the silver-skinned.” 
46. DENDROBIUM macrophyllum; folis ovato-oblongis obtusis nervosis 
basi subcordatis, sepalis lanceolatis lateralibus parúm productis, petalis ob- 
longis acutis, labello pubescente convoluto denticulato subunguiculato ovato 
callo baseos elevato transverso obsoleté trilobo. 
This, the handsomest of the Dendrobia, has been received 
by Messrs. Loddiges from Manilla, where it was found by 
Mr. Cuming. The flowers are nine inches in circumference, 
aud will probably be still larger when the plant becomes 
more healthy. The sepals and petals are a clear and bright 
rose-colour, the lip is downy and deeply stained with two 
large broad blood-red blotches at its base.” 
47. CATTLEYA superba; foliis ovato-oblongis obtusis coriaceis marginatis 
caule clavato brevioribus, sepalis oblongis acutiusculis, petalis lanceolatis 
aeutis membranaceis dupló latioribus, labelli trilobi cucullati lobis lateralibus 
acutis : intermedio transverso plano denticulato emarginato subunguiculato 
basi venis elevatis rugoso; callis duobus pone basin. Sertum Orchida- 
ceum, t. 22. 
. This magnificent sweet-scented Cattleya has been. found 
in British Guayana by Mr. Schomburgk, who sent a live 
plant of it to Messrs. Loddiges, and a drawing to the Linnean 
EX 2 
