102 
BEAUTIFUL FERNS. 
into from two to five veinlets. The sori are rather large, 
placed nearer the midvein than the margin, and are rarely 
produced towards the apex of the segments. 
The indusium is orbicular-reniform, and almost always 
smooth. Its edges are turned downward, enclosing the spor- 
angia, when they are young, and sometimes this convexity is 
permanent. Rarely the sinus is so deep that the indusium 
at las\ becomes divided. The spores are ovoid, and have a 
muricately roughened surface. 
The rhizomes have been used for ages ‘ as an anthel- 
mintic, but probably have no greater virtue in this direction 
than those of many other common species. 
