490 CONSERVATIVE ORGANS. JJLECT. IX. 



terms angled and lobed are, also, not unfre- 

 quently misapplied, although the distinction is 

 perfectly obvious: thus, each segment of an 

 angled leaf has the margins, which meet to form 

 the angle, straight or nearly so; whereas in a 

 lobed leaf the margins are always curved, so as to 

 give the lobes a rounded appearance, whether 

 their apexes be obtuse or pointed. The import- 

 ance of accuracy in the application of terms sig- 

 nificant of the forms of leaves, will be fully seen 

 when I come to treat of the classification of plants. 

 b. The solid configuration of a leaf is taken 

 from its real form, including length, breadth, and 

 thickness; determined by transverse and longi- 

 tudinal sections. It is termed Cylindrical (teres, 

 cylindrica), 1, when a transverse section, made 

 any where throughout the greater part of the 

 length of the leaf, is circular. If the diameter 

 be very small, so that the leaf is as fine as a 

 hair, the configuration is termed capillacea, the 

 distinction of which from capillary, consists in 

 the form of the capillaceous leaf being exactly 

 that of a hair, whereas the capillary is only 

 as small as a hair : Semicylindrical (semicy- 

 lindracea), 2, when one side of a leaf is flat 

 and the other convex: Tubular (tubulosa), 3, 

 when the greater portion of the leaf is cylindri- 

 cal, or nearly so, tapering to a point, and hollow 

 within. Sometimes the hollow appears as if it 



