AND THEIR MAXAGEMENT. 431 



Physosiphon. 



condition. The\' require a liberal amount of moisture 

 while in an acti\e state, and must not be allowed to 

 suiter from want of root moisture at an\- season. They 

 should be grown in the cool intermediate-house. 



PHYSURUS. 



Terrestrial leafy Orchids belonging to the tribe Xcottit:(£. 

 They have usually fasciculate root-fibres, in a creeping 

 rhizome, and inhabit the warmer parts of Asia and 

 America. The name gi\'en b\' Richard is from physa, a 

 bladder, and oura, a tail ; in allusion to the shape of the 

 spur. Flowers small or mediocre, disposed in loose or 

 dense, often elongated, almost sessile spikes ; sepals and 

 petals nearly equal, the lateral sepals placed beneath the lip, 

 and the dorsal one agglutinated to the petals ; lip parallel 

 with the column, conca\'e, constricted below the apex, and 

 extended downwards into the freel}'-swollen spur ; column 

 free or adnata to the bottom of the lip, straight, and 

 attenuated into an ultimatel)- bifid rostellum, having the 

 anther at the back, containing two sectile pollen-masses, 

 attached to an oblong or subulate gland. Leaves stalked, 

 loosely-sheathed, often beautifull}- \-eined. The species 

 require the same cultural conditions as AiuvctOiliilHS. 



PILUMNA {LindL). A synonym of Trichopilia. 



PLATYCLINIS. 



Epiphytal Orchids belonging to the tribe Epidendyea. 

 The name given by Bentham is deri\'ed from platys, 

 broad, and dims, a couch ; alluding to the broad mem- 

 branous clinandrium. The species, which are natives of 

 the East Indies and Malayan Archipelago, are better 

 known in gardens under the name of Dendrochihini. The 

 genus comprises about eight species, all of which require 

 stove or East Indian-house treatment. They have 

 stems tufted at the base, or sub-ramose and simple, and 

 one-leaved towards the base, and scarcely thickened or 

 narrowly pseudo-bulbous. Flowers small, in numerous 

 terminal racemes, shortly pedicellate ; sepals narrow. 



