36 



variety, and has larger flowers than any of the racemose 

 species of the genus. Sir W. Hooker has observed a gland 

 and caudicLila in my Polystachya macrantha (Bot. Mag. t. 

 3707.)? which is probably the Dendrohium galeatum of 

 Swartz ; I had previously noted the same thing in P. ramu- 

 losa (Bot. Reg. 1838. misc. no. 144.), and I find a similar 

 structure in the present species ; it is therefore probable that 

 the genus Polystachya should be placed in Vandea?, among 

 the genera belonging to which subdivision a better station 

 may be found for it than next to Dendrobium. 



45. ISOCHILUS lividum ; pseudobulbis fusiformlbus attenuatis squamis pal- 



lidis iTnembranaceis arct^ vestitis, foliis solltariis linearibus apice obscure 

 2-3-dentatis, racemo caplllari secundo iiutante subtrifloro folio multo bre- 

 viore, sepalis petalisque ovatis concavis patulis, labello cordate 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 ; foliis ovato-oblongis obtusis nervosis 



basi subcordatis, sepalis lanceolatis lateralibus parum productis, petalis ob- 

 longis acutis, labello pubescente convoluto denticulate subunguiculate ovate 

 callo baseos elevate transverse obsolete 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, 

 and 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. CAITLEYA superba ; foliis ovate-oblongis obtusis coriaceis marginatis 



caule clavato brevioribus, sepalis oblongis acutiusculis, petalis lanceolatis 

 acutis membranaceis duplo latioribus, labelli trilobi cucullati lobis lateralibus 

 acutis : intermedio transverse plane denticulate emarginate subunguiculate 

 basi venis elevatis rugose; 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 



