filices—A splenium. 547 
A, viride differs in its smaller size and green rachis. It is 
found in the mountains of Wales and Scotland. 
3. A. marinum.—tThis is a stout tufted species from 6 
inches to afoot high, with pinnate coriaceous oblong-lanceolate 
fronds, and oblong crenate pinnules. It grows on rocks in the 
vicinity of the sea, chiefly in the south-west. It occurs in 
South-western Europe, North Africa, and North America. 
4, A. Adidntum-nigrum.—This is perhaps the commonest 
of the native species of this section. It has bi- or tripinnate 
triangular coriaceous fronds 6 to 12 inches long, with narrow 
pinnatifid and toothed pinnules. Stipes slender, naked. It is 
found throughout Europe, North Africa, and Western Asia, 
growing on dry banks and rocks. 
A. lanceoldtum is very near the last, but the fronds are 
membranous, and the pinnules narrower and more acute. It 
is rare in Britain, and only found in Wales and Western 
England. 
§ 2. Cfitzracn.—Frond covered with chaffy scales beneath ; 
veins anastomosing. 
5. A. Céterach, syn. Céterach officinarum.—Fronds about 
6 inches long, pinunatifid; pinnules alternate, rounded. This 
Fern is readily known from all other indigenous species by its 
linear-lanceolate coriaceous fronds, which are densely clothed 
beneath with rusty chaffy scales, effectually concealing the 
fructification. It is usually found on walls and dry banks. It 
is a native of Europe, Western Asia, and North Africa. 
§ 3. AruYrium.—Indusium oblong or reniform, fringed at the 
margin. Veins free. 
6. A. Filia-fémina. Lady Fern.—A very beautiful species 
with delicate bright green bi- or tripinnate fronds from 1 to 4 
feet high ; pinnules small, crowded, sessile, acuminate. Stipes 
stout, densely dotted with chaffy scales at the base. The 
numerous varieties in cultivation differ in size, aspect, and in 
the cutting and lobing of the fronds to a degree almost in- 
credible, and include some of the most elegant and graceful of 
hardy Ferns. A. Rhcticum with bipinnate narrow fronds, and 
A. ineisum with very large tripinnate fronds, are two of the 
commonest wild forms. Widely distributed in the northern 
hemisphere. 
NN 2 
