on British Ferns. 
xxi 
Rliizoma tufted ; stipes short, densely clothed with red- 
dish scales ; fronds semi-erect, lanceolate, pinnate ; pinnae 
numerous, pinnate ; pinnules blunt, serrated; involucre ve- 
ry perfect, without stalked glands ; clusters of capsules less 
crowded nearer the midrib, absent from the lower pinnae. 
Common everywhere. 
Ohs. — Two apparent species, when better understood, maybe intro- 
duced here, Lophodium erosum, the Aspidium erosum of Schkukr, 
and L. abbreviatum, the Polystichum abbreviatum of Decandolle. 
Lophodium (rigidum) fragrans. 
1753. Polypodium fragrans, Linn. Sp. PL 1089, (1st edi- 
tion) ; Huds. FI. Ang. 388, (1st edition) ; With. Arr. 
650 ; Villars, Hist. PL Dauph. iii. 843. 
1795. Polypodium rigidum, Hoffm. Deutscli. Flor. ii. 16. 
1810. Polystichum strigosum, Roth, FI. Germ. iii. 86. 
Aspidium fragrans, Gray, Nat. Arr. ii. 9. 
Aspidium rigidum (Swartz), Hook. E. B. S. 2724 ; Hook, 
and Am. 569. 
Lastrea rigida ( Presl ), Neiom. N. A. 19, A 1 . 191 ; Bah. 411. 
Rliizoma tufted ; stipes much shorter than the frond, 
densely clothed with reddish scales ; frond semi-erect, 
glandulose, sweet-scented, lanceolate, pinnate ; pinnae very 
numerous ; pinnules oblong, obtuse, serrated ; involucre 
very perfect, fringed with stalked glands ; clusters of cap- 
sules very crowded, covering the pinnules, absent from the 
lower pinnae. 
Not uncommon upon limestone rocks in the North of 
England. 
Genus. — Hemestheum. 
Clusters of capsules on both branches of the lateral 
veins, and equidistant from the mid-vein, so as to form a 
continuous submarginal series, which, in the first division, 
is completely covered by the revolute margin of the pin- 
nule ; in the second division, nearly so : involucre insta- 
ble, sometimes totally absent, at other times small, indis- 
tinct, subreniform, evanescent : first upper pinnule longer 
