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1 0 0 TFIE BRITISH FERNS.
THE MOUNTAIN PARSLEY PERN, or ROCK BRAKES.
ALLOSORUS CRISPUS.
A, fronds of two kinds, ovato-deltoid, bi-tri-pinnate; ultimate
divisions of tlie sterile fronds obovate wedge-sbaped, often bifid ;
tliose of tbe taller fertile fronds linear or oblong, tbeir margins
recurved over tbe roundisb sori. [Plate X I I I .]
A llosorxts c r is p u s , Bcmliardi, Schrad. N. Journ. Bot. 1806, i., p t. ii. 5, 36.
BaUngton, Man. Brit. Bot. 4 ed. 410. Dcakin, Florigr. Brit. iv. 47, fig.
1585. Newman, Hist. Brit. Ferns, 3 ed. 35. Moore, Handb. Brit. Ferns,
3 ed. 70 ; Id ., Ferns o f Gt. Brit, and Ireland, Nature Printed, t. 8 (excl.
syn. Rupreclit and Gmelin) ; Id ., In d . Fil. 44. Sowerby, Ferns o f Gt. Brit.
69, t. 39. Sprengel, Syst. Veg. iv. 65. Presl, Tent. Pter. 152. Koch,
Synops. 2 ed. 985. Bentham, Handb. Brit. FI. 627. Loioe, Nat. Hist.
Ferns, iii. t. 34. Nyman, Syll. FI. Europ. 434.
O sm u n d a c r is p a , Linnæus, Sp. Plant. 1522. Bolton, Fil. Brit. 10, t, 7. Hudson,
FI. Ang. 450. Flora Danica, t. 496. Savigny, Lam. Enc. Bot. iv . 657.
Osm u n d a r u p e s t r i s , Salisbury, Prod. 402.
P t e r i s c r is p a , Linnæus MS. Smith, FI. Brit. 1137 ; Id ., Eng. Bot. xvii.
t. 1160 ; Id ., Eng. FI. 2 ed. iv. 306. Schkuhr, Krypt. Gew. 90, t. 98. Will-
denoxo, Sp. Plant, v. 395 (excl. syn. Gmelin).
P t e r i s t e n u if o l t a , Lamarck, FI. Franç. i. 13.
A c e o s t ic i iu m c r is p u m , Villars, Hist, des PI. Dauph. iii. 838.
O n o c l e a c r is p a , Hoffmann, Deutschl. FI. ii. 11.
C r y p t o g r a m m a c r is p a , B. Brown, App. Frankl. Narr. o f Journ. to Polar Sea,
754, 767. Hooker, Gen. Fil. t. 115 B (sori too long) ; Id ., Sp. Fil. ii. 128
(European form, excl. syn. Gmelin, Tnrczaniiiow, and Rnpreclit). Hooker
At Arnott, B rit. FI. 7 ed. 590. Maekay, FI. Hib. 343.
P h o r o l o b u s c r is p u s , Desvatex, A n n . Soc. L in n , de Paris, v i . 291. Fée, Gen.
Fil. 131, t. 7 O.
B l e c h n u m c r is p u m , Hartmann, FI. Scand. 3 ed. 255.
R i e d l e a c r is p a , Mirbcl.
S t e g a n ia o n o c l e o id e s , Gray, Nat. Arr. Brit. PI. ii. 16.
St e g a n ia c r is p a , R Broxvn, Prod. FI. Nov. Holl. 152, in obs.
S t r u t i i io p t e r i s c r is p a , Wallroth, Bluff' et Fingerhuth, Comp. FI. Germ. iii. 27.
Caudex small, short, tufted, erect or decumbent, scaly. Sealee
membranous, pale brown, subulate. Fibres numerous, branched,
dark brown, wiry, and slightly covered with small hair-hke scales.
Vernation oiroinate.
Stipes as long as, or usually longer than the frond, pale green,
slender, smooth, with a few scattered scales near tho base ; lateral
and adherent to the caudex. Bachis smooth.
Fronds from four to twelve inches high, including the stipes,
herbaceous, of a lively green, terminal on the caudox, triangular
or ovate-triangular in outline, of two forms, and hence desonhcd
as dimorphous. Sterile fronds leafy, usually about as long as the
stipes, hi- or tri-pinnato, smooth. Pimm alternate or sub-opposite,
triangular-ovato, spreading, the lower ones largest. Pinnules alternate,
ovate, largest on the lower side of the piiinoe, pinnate or
pinnatifid, the pinnulets or lobes ovate, or obovate-cuncate ; the
latter or smaller ones, cut into linear acute teeth, and tho former
into ciineate-linear bifid lobules, having acute incurved teeth. The
ultimate divisions are, however, variable in form, being sometimes
oblong-oval, with sinuously shallow-toothed margins, this form of
development apparently representing fertile fronds, whose fructiferous
growth has become arrested and abortive. Feriile fronds
contracted, usually about one half as long as their stipes, tripinnate
or in some oases quadripinnate in the basal portions of the
lower pinnæ. Pinnæ alternate or suh-opposite, ovato, spreading,
the lower ones largest. Pinnules alternate, ovate in outline, bipinnate
or pinnato-pinnatifid in the lower pinnæ, pinnate only above.
All the ultimate divisions are stalked, obtuse, and linoar-oblong
from the involution of the margins, which are pale-coloured,
orenated, and indusioid.
Venation of the barren fronds consisting of a slender costa extending
along each pinnule, and casting off a vein into each of its lobes or
pinnulets, this again becoming alternately branched, so that a venule
or veinlet runs along the centre nearly to the point of each segment
—simple whore the segment is undivided, and forked where it is
bifid, one branch boing directed towards every margfeal tooth.
In tbe fertile fronds a costa or midvein enters each ultimate division,
and passes in a sinuous course to its apex, throwing out
alternate veins which extend nearly to the margin, and are usually
simple hut sometimes forked and bear a sorus near to their
extremity.
Frudif cation on the hack of the frond, and usually occupying
the whole under surface. Sori small, roundish, situated near the
extremity of the venules ; at first distinct though contiguous, ultimately
becoming laterally confluent and forming a continuous line.
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