THE BRITISH FERNS. 
tt Indusium fringed with stalked glands. 
4. L. rigida: fronds bipinnate, glandular. 
** Serratures of pinmules spinose-mucronate. 
+ Scales of stipes ovate ; indusium without marginal glands. 
5. L. cristata: fronds erect, narrow linear, pinnate ; pinne short triangular; 
pinnules oblong, all connected, basal ones nearly equal, crenate-serrate or 
lobed, with aristate teeth. 
var. uliginosa: fronds erect : the fertile narrow-linear-lanceolate, bipinnate 
below ; pinnules oblong acute, mostly adnate, inciso-serrate or lobed, 
with aristate teeth, basal ones nearly equal; segments of sterile 
and autumnal fertile fronds broader. 
var. spinulosa: fronds erect, narrow-oblong-lanceolate, bipinnate ; pinnules 
oblong acute, posterior basal ones much the longest, all lobed or 
pinnatifid, with aristate teeth. 
+t Scales of stipes lanceolate, entire or fimbriated ; indusium with stalked 
marginal glands. 

+ Scales two-coloured, the centre darker ; caudex erect. 
. dilatata: fronds lanceolate, ovate or subtriangular ovate, bi-tri-pinnate. 
var, dumetorum: fronds dwarf, oblong-ovate or triangular, bipinnate, very 
glandular ; pinnules oblong, with coarse teeth ; scales broad lanceo- 
late, fimbriate, sometimes pallid. 
. collina; fronds narrow ovate elongate, bipinnate ; pinnules oblong- 
obtuse, lobed ; lobes obtuse, serrate at end ; teeth coarse, acuminate. 
. Chanterie: fronds lanceolate narrowed below, caudate-elongate at 
apex; pinne distant, the lowest only unequal ; pinnules oblong- 
obtuse, distant, pinnatifid, the lobes coarsely toothed. 
. angusta: fronds linear-lanceolate, bipinnate ; pinne short deltoid, very 
unequal. 
. alpina: fronds narrow linear-lanceolate, membranaceous ; scales broader, 
and paler; sori large ; indusium small, fugacious, ragged. 
. nana: fronds small, ovate, bipinnate; indusium small, fugacious, 
slightly glandular. 
var. tanacetifolia: fronds ample, triangular, tripinnate ; indusium small, 
slightly glandular. 
ver. cristata: fronds and pinnee dilated, or once or twice irregularly forked 
or crested at the apex. 
11 Scales pallid whole-colowred, or very indistinctly two-colowred. 
(a) Caudex erect. 
var. lepidota: fronds broadly ovate, quadripinnate ; ultimate pinnules small, 
pinnatifid, spiny-toothed ; stipes and rachis everywhere densely scaly. 
(8) Caudex decumbent or creeping. 
var. glandulosa: fronds ample, lanceolate-ovate or oblong-lanceolate, tri- 
pinnate below, very glandular ; scales broad, lanceolate-ovate, semi- 
appressed. 
ttt Scales of stipes lanceolate, crumpled or laciniated ; indusium with 
sessile marginal glands. 
7. L, emula: fronds triangular or triangular-ovate, tripinnate, hay-scented ; 
pinnules concave. 

