EHRHART’S FERN. 41t 
nearly equal length with the leafy part of the frond, 
“very erect, and clothed with scattered, broad, obtuse, 
short, semitransparent, pale brown, uniformly coloured 
scales. The frond itself is erect, rigid, narrow, linear 
and pinnate: the pinne, which are attached by their 
midrib only, are generally rather distant, short, broad 
at the base, nearly triangular, and either pinnate or 
deeply pinnatifid: the pinnules are very blunt at the 
tip and toothed both at the tip {and along the sides: 
they are united together at the base, and are almost 
invariably attached to the midrib of the pinna by their 
greatest diameter. When the frond is very luxuriant 
and fruitful the pinne are longer and the pinnules 
more distant from each other. The lateral veins of 
_ the pinnules are many-branched, and the anterior 
branch bears a circular mass of seeds about half-way 
between the midvein and edge of the leaf; these 
_ Masses are covered by a flat, kidney-shaped involucre, 
the edges of which are waved, but not jagged or torn: 
in luxuriant specimens the masses are much crowded 
and at last become confluent: the seed is always con- 
fined to the upper part of the frond. 
_ Callipteris is common on the continents of Europe 
and North America, but has not been found in the 
Atlantic Islands. In England it occurs in three 
counties: Wybunbury Bogs, in Cheshire; Oxton Bogs 
and Bulwell Marshes, i in Nottinghamshire; Bawsey 
Heath, near Lynn, near the village of Dersingham, 
