XV. TRICHOMANES. 
201 
[Trichomanes radicaus.] 
the damp 
surface of 
the rocks. 
It is stated 
that they 
are three 
years ar- 
riving at 
a mature 
condition, 
attaining 
their full de- 
velopment in 
the second 
autumn, and 
becoming fruit- 
ful in that of 
the third year, 
after which 
they show 
sy pmtoms of 
decay; the 
barren fronds, 
however, re- 
taining their 
freshness in 
congenial si- 
tuations for 
many years. 
The stipes, 
which is some- 
times less than 
one-fourth the 
length of the 
leafy portion, 
and s o m e- 
times equals it 
in length, is 
