VII. LASTKKA. 
107 
[Lastrea FUix-ir.as, var. incisa-j 
posterior branch again 
forked, or sometimes be- 
coming still more di- 
vided. The anterior 
branch on a greater or 
less number of these ve- 
nules towards the base 
of the pinnule, bears a 
sorus just above its ori- 
gin, the son forming a 
short line on each side 
near to the mid-vein, and 
extending r'<out half the 
length of the pinnule. 
The son are covered by 
very persistent reniform 
convex indusia, which 
are smooth, that is, with- 
out projecting glands on 
their margin, and are 
connected to the back of 
the veins by their sinus, 
which is turned towards 
the rachis. The fructi- 
fication, which is con- 
fined to the upper part 
of the fronds, becomes 
mature about August, 
and in favourable loca- 
lities the fronds remain 
for a considerable period 
in a perfect state. 
The variety incisa 
may be considered as a 
more highly developed 
condition of the plant. 
It is of more robust 
