100 BRITISH FERNS. 
2. N. Oreopteris . Fronds pinnate, glandular beneath. 
3. N. Filix-mas. Fronds bipinnate and broadly lanceo- 
late, 
a . var. cristatum. Fronds crested at the summit. 
b . var. Jervasii . Fronds large ; pinnae long ; crest 
tasselled. 
c. var. pumilum . Fronds dwarf; leaflets large in 
proportion. 
d. var. Clowesii. Fronds tasselled at the apex. 
e. var. Bollandii. Fronds broad and waved. 
/. v. abbreviatum. Fronds dwarf ; leaflets crisped. 
g . var. angustatum . Fronds narrow, crested. 
h . var. incisum. Fronds robust, stately, contract- 
ing near the apex. 
i. var. trapeziforme . Fronds golden-green. 
j. var. recurvum. Margin of leaflets recurved. 
k . var. giganteum . Fronds very large. 
/. var. flexuosum . Fachis zigzag in form, 
m. var. eroswn . Fronds dwarfed. 
4. iV. rigidum . Fronds bipinnate, without spinulose 
serratures, glandular. 
5. iV. cristatum . Fronds pinnate, pinnatifid, linear- 
lanceolate. 
а. v. inter r upturn. Pinnae dwarfed and shortened. 
б. var. fur cans. Pinnae forked. 
6. JV. spinulosum. Fronds oblong or ovate-lanceolate. 
a . var. bipinnatum. Fronds short, bipinnate. 
£. var. validum . Fronds tall ; pinnae concave ; 
leaflets crisped. 
c. var. interruptum. Some of the pinnae dwarfed. 
d. var. pigmceum . Fronds dwarf. 
e. yylt. tanacetifolium . Fronds large and triangular; 
stems arched. 
