72 BRITISH FERNS. 
Points; the clusters of seed are seated on these veins; 
and are nearly circular; when young they are often 
partially covered by an involucre, which is attached 
behind them, and bends forward over them; this in- 
volucre is very various in size, often entirely wanting ; 
its free edge ig Jagged and uneven: it is soon alto- 
gto 
Lawers, in 1836, and subsequently in other neigh- 
_ bouring localities by the late Mr. Borrer, by Mr. 
of Europe. : 
To cultivate this fern Suecessfully a small quantity 
