
W O O D S I A OÎ ÎTUSA .
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The fronds, -which arc lanceolate, are suh-trijiinnate, clothed
beneath -with glandulous h a irs; the pinnæ arc triangula rly
elongate; the pinnules oblong, rounded at the apex, and
crenate on the margin.
Sori terminal.
Indusium profoundly laciniated.
Fronds terminal, and adherent to a some-what tufted rhizoma,.
L en g th of frond twelve inches; colour yello-wish green.
J l r . Henderson, of W en tw o rth , has been k in d enough to
send me a p lan t, and Mr. G. Norman, of H u ll, fronds.
The illustration is from a p la n t in my own collection.
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C Y S T O P T E R I S . 71
GENUS XI.
C Y S T O P T E llIS . BERxii.riiDi.
• A n i n t e r e s t i n g , d w a r f , e l e g a n t , s m a l l t r i b e , w i t h m e m h r a n a c o o -
h e r b a c e o u s f r o n d s .
The sori medial and covered hy an indusium, which is
attached by its broad base.
The veins are simple, forked, or pinnate, from a central
costa; the venules being free.
Fronds much divided.
Rhizoma tuftod, decumbent, or creeping.
This small genus is a native of the temperate or cold
climates, the fronds dying down in winter.
Eng lan d boasts of possessing nearly the whole of the species,
namely:— Cystopteris fr a g ilis , angustifolia, fv a r . of fr a g ilis ,]
regia, montana, dickioana, and dentata, ( var. of f r a g ilis .)
The name is derived from th e Greek, and signifies a
Bladde r E e rn , in allusion to the inflated indusia.
The fronds vary from three to eighteen inches in length.
Mr. Moore, in “ The Genera and Species of Cultivated E e rn s,”
enumerates—
Fragilis. Bei'nhardi.
Dentata. Hooker.
Dickieana. Sim.
Bulbifera. B ernhardi.
Also, in his “ In d ex Filicum,
Fragilis. Bernhardi.
Regia. Desvaux.
Bulbifera. Bernhardi.
Alpina. Desvaux.
Tenuis. Schott.
Montana. L in k .
Douglasii. Hooker.
Tenuis. Desvaux.
Montana. Bernhardi.
Mr. Moore considers alpina and regia as forms of the same
F e rn , and fr a g ilis , angustata, dentata, and dickieana, as all
forms of fra g ilis .
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