CHAPTER XVI, 



NIT IS, Swartz. 

 (Tsen-i'-tis.) 

 Fillet or Ribbon Ferns. 



N Hooker and Baker's "Synopsis Filicum " Tcenitis (which 

 derives its name from tainia, a fillet or ribbon, in allusion to 

 the linear leaflets) forms a part of the tribe Grammitidece, as 

 Genus 57. It comprises only six known interesting species, 

 all of which require stove treatment. Their sori (spore masses) 

 are linear, but the line of fructification, either central or sub-marginal, though 

 usually uniform, is sometimes interrupted. Some of the species scarcely differ 

 from Tceniopsis (included under Vittaria) in fruit, but in all of them the 

 veins intercross each other. 



Culture. 



The plants comprised in this genus require a soil of a peaty nature (two 

 parts peat to one of loam), a moist atmosphere, and abundant shading. They 

 are generally propagated by the division of the crowns. 



Species and Varieties. 



T. angustifolia — an-gus-tif-ol'-i-a (narrow-leaved), R. Brown. 



This species, native of Cuba and North Brazil, has simple (undivided) 

 fronds 1ft. to ljft. long, Jin. to Jin. broad, very gradually narrowed to a 



