Filices—A diantum. 545 
A, pedatum, a species occurring both in North America and 
Asia, is nearly or quite hardy in suitable situations. It has 
dichotomous fronds, the main divisions of which are flabellately 
branched, and small dimidiate pinnules broadest on the side 
nearest the stem. 
2. PTERIS. 
Rhizome creeping. Frond coriaceous, 3- or 4-pinnate ; veins 
free. Sori marginal, continuous. Indusium membranous, con- 
fluent with the recurved margin. A large genus containing about 
eighty species, found in all parts of the world except the very 
coldest. The name is from wrepov, a wing, in allusion to the 
form of the fronds. 
1. P. aquilina. Brake or Bracken.—It is unnecessary to 
describe this the commonest of all native Ferns in detail. In 
different situations its fronds vary from 1 to 8 feet or more 
high, with a tall stout stipes. This Fern is found in nearly all 
parts of the world. 
8. CRYPTOGRAMME. 
Rhizome tufted. Fronds 2- to 4-pinnatifid, outer sterile, 
inner fertile ; veins forked, free. Sori terminal, nearly circular, 
at length continuous. Indusium continuous with the reflexed 
margin of the pinnules. This genus is limited to the following 
species, which is widely dispersed throughout the north tempe- 
rate and arctic regions. The name is compounded of xpumtos, 
hidden, and ypappy, writing, in allusion to the concealed sori. 
1. C. crispa, syn. Allosérus crispus. Parsley Fern, Rock 
Brake.—A dwarf tufted Fern with Parsley-like barren fronds, 
about 8 inches high, tripinnate; pinnules bi-tri-pinnatifid ; 
stipes short. This plant is found in mountainous districts in 
Britain, and extends to Asia and North America. 
4, LOMARIA. 
Rhizome tufted or creeping. Fronds once pinnate or pinna- 
tifid; outer spreading, barren ; inner erect, slender, and fertile. 
Sori linear, covering the under side of the pinnules. Indusinum 
searious. There are forty species referred to the genus. The 
name is from Apa, a border, or fringe, the marginal sori. 
1. L. Spicaut, syn. Bléchnwm boredle. Hard Fern.—Fronds 
tufted, 12 to 18 inches high ; barren ones lanceolate in outline, 
pinnate below, pinnatifid upwards; pinnules oblong. There are 
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