THE [ASPLENIA 
75 
most of our species resent, it assumes a much larger size than in the 
open. In a vinery at Richmond we have seen a plant of it with 
fronds two feet long, formingla huge plant, a marked contrast to 
even the most vigorous plants we have 
found elsewhere. In congenial habitats 
it is abundant, filling the crevices on the 
cliff rocks, and lining the roofs of sea caves 
with rosettes of light green fronds, in posi- 
tions where every tide must bathe them 
in sea water, a point worth remembering 
in its culture, which otherwise is that of 
rock Ferns generally, though protection 
from frost is essential in winter, and as 
we have seen, warm greenhouse culture 
greatly favours development. Although 
a number of varieties have been recorded, 
most of these are of rather indefinite or 
erratic character, the best being— 
IMBRICATUM (Fig. 34), in which the 
fronds are congested, and the pinna over- 
lapping. 
Prumosum.—A very beautiful, robust, 
bipinnate form, barren and rare. 
Ramosum.—A very marked variety, with 
branching fronds, found in Dorsetshire by 
Mr. G. B. Wollaston. 
Fig. 35. Asp. rula-muraria. 

Asp. marinum imbricatum. 
(A young plant.) Asp. ruta-muraria cristatum. 



