soon withering, often illusive. Fronds two to three pinnate, very graceful.
Moisture-loving species. Bladder Ferns. _Cystopteris_.

[Illustration]

Indusium star-shaped, of a few irregular segments fixed beneath the sorus,
often obscure. Mostly small, rock-loving plants, usually rather chaffy, at
least at the base, and growing in tufts. _Woodsia_.

[Illustration]

Indusium cup-shaped, fixed beneath the sorus, supported by the tooth of a
leaf; sporangia borne in an elevated, globular receptacle open at the top.
Fronds finely cut. Hayscented Fern. _Dennstædtia_.

[Illustration]

(3) Fruit-dots and indusium linear. (But see _Athyrium_.)

Very long, nearly at right angles to the midrib, double; blade thick
oblong-lanceolate, entire; heart-shaped at the base. Hart's Tongue.
_Scolopendrium_.

[Illustration]

Shorter and irregularly scattered on the under side of the frond, some
parallel to the midrib, others oblique to it, and often in pairs or joined
at the ends; blade tapering to a slender tip. Walking Fern. _Camptosorus_.

[Illustration]